1.Gangnam Style

"Gangnam Style" is the 18th K-pop single by the South Korean musician Psy. The song was released on July 15, 2012, as the lead single of his sixth studio album Psy 6 (Six Rules), Part 1, and debuted at number one on South Korea's Gaon Chart. On December 21, 2012, "Gangnam Style" became the first YouTube video to reach one billion views.The song's music video has been viewed over 2.51 billion times on YouTube, and has been YouTube's most watched video since November 24, 2012, when it surpassed the music video for "Baby" by Justin Bieber.

The phrase "Gangnam Style" is a Korean neologism that refers to a lifestyle associated with the Gangnam District of Seoul. The song and its accompanying music video went viral in August 2012 and have influenced popular culture worldwide since then. "Gangnam Style" received mixed to positive reviews, with praise going to its catchy beat and Psy's amusing dance moves (which themselves have become a phenomenon) in the music video and during live performances in various locations around the world. In September 2012, "Gangnam Style" was recognized by Guinness World Records as the most "liked" video on YouTube. It subsequently won Best Video at the MTV Europe Music Awards held later that year. It became a source of parodies and reaction videos by many different individuals, groups and organizations.

By the end of 2012, the song had topped the music charts of more than 30 countries including Australia, Canada, France, Germany, Italy, Russia, Spain, and the United Kingdom. As the song continued to rapidly gain popularity and ubiquity, its signature dance moves were attempted by many notable political leaders such as the British Prime Minister David Cameron, U.S. President Barack Obama, and United Nations Secretary-General Ban Ki-moon, who hailed it as a "force for world peace". On May 7, 2013, at a bilateral meeting with South Korea's President Park Geun-hye at the White House, U.S. President Barack Obama cited the success of "Gangnam Style" as an example of how people around the world are being "swept up" by the Korean Wave of culture.

2.Blank Space

"Blank Space" is a song by American singer-songwriter Taylor Swift from her fifth studio album 1989 (2014). It was written by Swift,Max Martin and Shellback. The song was released to the radio by Republic Records on November 10, 2014 as the album's second single, after "Shake It Off" and is the second track on the album. Musically, "Blank Space" is a electropop song with lyrics that satirize the media's perception of Swift and her relationships.

"Blank Space" was a critical and commercial success, having reached number one on the US Billboard Hot 100 following "Shake It Off". Swift became the first woman in the Hot 100's 56-year history to succeed herself at the top spot. It has also been included in numerous year-end critics' lists. The song has also topped charts in Canada, South Africa and Australia. It also charted in the top 10 in numerous countries, such as Austria, Czech Republic, Germany, New Zealand, Spain, and the United Kingdom.

The song's accompanying music video was directed by Joseph Kahn and was shot over three days at Oheka Castle in Huntington, New York. The song received its first televised performance at the 2014 American Music Awards and as part of "Taylor Swift's 1989 Secret Session with iHeartRadio" on October 27, 2014, in New York City.

The song received nominations for the 58th Annual Grammy Awards for Record of the Year, Song of the Year and Best Pop Solo Performance.

3.See You Again

"See You Again" is a song recorded by American rapper Wiz Khalifa featuring American singer Charlie Puth. The track was commissioned for the soundtrack of the 2015 action film Furious 7 as a tribute to the late Paul Walker. The artists co-wrote the song with its co-producers, DJ Frank E and Andrew Cedar, with additional production from Puth and mixing provided by Manny Marroquin. "See You Again" was released on March 17, 2015, as the soundtrack's lead single in the United States. "See You Again" was written in memory of Paul Walker, who died in a single-vehicle accident on November 30, 2013 in Valencia, California. Because the filming of Furious 7 was underway, Paul's brothers offered to step in so the movie could be completed.

"See You Again" was a global commercial success, becoming both Khalifa's and Puth's biggest hit to date. It peaked at number one on the Billboard Hot 100 for 12 non-consecutive weeks, tying Eminem's "Lose Yourself" for the longest-running rap number-one hit in the country, and in the United Kingdom on the UK Singles Chart for two consecutive weeks. It also reached number one in several other countries including Australia, Austria, Canada, Germany, Ireland, New Zealand and Switzerland. The song holds the record for the most-streamed track in a single day on Spotify in the United States. It set the record for most streams in a single week worldwide, and in the United Kingdom also in a single week. On October 7, 2015, the video reached over a billion views on YouTube, making it the very first hip-hop song to do so. "See You Again" was nominated for three Grammy Awards at the 58th ceremony: Song of the Year, Best Pop Duo/Group Performance and Best Song Written for Visual Media. It was also shortlisted for the Song of the Year for the BBC Music Awards and was nominated for the Golden Globe Award for Best Original Song at the 73rd Golden Globe Awards.

4.Uptown Funk

"Uptown Funk" (stylised as "UpTown Funk!") is a song recorded by British producer Mark Ronson, with vocals from American singer Bruno Mars, for Ronson's fourth studio album, Uptown Special (2015). RCA Records released the song as the album's lead single on 10 November 2014. Jeff Bhasker assisted the artists in co-writing and co-producing the track, with additional writing from Philip Lawrence. This is Mars' fourth collaboration with Ronson (following Mars' own songs "Locked Out of Heaven", "Moonshine", and "Gorilla") and sixth with Bhasker (after "Talking to the Moon", "Young Girls" and the three previously mentioned songs).

The single received widespread critical acclaim from music critics, winning both its Grammy Award nominations for Record of the Year and Best Pop Duo/Group Performance. The song was also a global commercial success, spending fourteen consecutive weeks at number one on the US Billboard Hot 100, seven non-consecutive weeks at number one on the UK Singles Chart, and topped the charts in several other countries including Australia, Canada, France, Ireland and New Zealand. In the week of 25 January 2015, the song was streamed a record 2.34 million times in a single week in the UK, a record later surpassed by Ellie Goulding's "Love Me like You Do" (2.58 million streams). The latter song also beat "Uptown Funk" for the highest number of streams in one week worldwide, with 15.5 million. "Uptown Funk" also set a new record for the highest number of streams in one week in the US, with 4.8 million streams. Worldwide, the song has accumulated an estimated 15.2 million points from sales and streams. In 2015, "Uptown Funk" won Ronson the Brit Award for British Single of the Year. The video for "Uptown Funk" was also nominated for five MTV Video Music Awards in 2015, winning Best Male Video. According to Billboard magazine, the song has earned $2.7 million in publishing royalties (excluding TV and film synchronization revenue), $1.9 million of which went to the writers based on their respective publishing deals. On June 24, 2015, it was reported that Trinidad James earned over $150,000 USD in royalty earnings from Uptown Funk's interpolation.

The song features heavy inspiration from the Minneapolis sound of 1980s-era funk music, having a spirit akin to works by Prince as well as Morris Day and The Time. Copyright controversies about "Uptown Funk" have dogged Ronson and Mars, with The Gap Band's three core members being added on as songwriters as part of a mutually settled agreement given the inspiration given to the track by "Oops! Upside Your Head". Serbian pop artist Viktorija has also argued that "Uptown Funk" infringed on her track "Ulice Mracne Nisu Za Devojke".

The video received its billionth view on YouTube on 15 September 2015 (UTC), becoming the fourth most watched video on YouTube.

5.Shake It Off

"Shake It Off" is a song recorded by American singer-songwriter Taylor Swift for her fifth studio album, 1989 (2014). Written by Swift, Max Martin and Shellback, it is an uptempo pop track and features a departure from Swift's earlier country pop musical style. "Shake It Off" is the sixth track on the album and serves as the lead single. The song premiered during a Yahoo! live stream session on August 18, 2014; its music video was also released the same day. Several hours later, the song was made available for digital download.

"Shake It Off" received mostly positive reviews from music critics, who praised its musical style, while its music video was met with a mixed reception. "Shake It Off" debuted at number one on the Billboard Hot 100 chart for the week ending September 6, 2014, becoming Swift's second number-one single in the United States and the 22nd song to debut at number one in the chart's history.The song won Favorite Song at the 2015 People's Choice Awards, and also received nominations for Record of the Year, Song of the Year and Best Pop Solo Performance at the 2015 Grammy Awards.

6.Baby

"Baby" is a song by Canadian recording artist Justin Bieber. It was released as the lead single from the latter half of Bieber's debut album, My World 2.0. The track was written by Bieber with Christopher "Tricky" Stewart and Terius "The-Dream" Nash, both of whom worked with Bieber on "One Time", and also by R&B singer Christina Milian and labelmate, rapper Ludacris.

It was available for digital download on January 18, 2010. The song received airplay directly after release, officially impacting mainstream and rhythmic radio on January 26, 2010. The song is uptempo R&B, blending together dance-pop and hip-hop elements, while using influences of doo-wop music. The song has received positive reviews from critics who complimented the song's effective lyrics and chorus, and commended Ludacris' part and the song's ability to have an urban twist.

The song was a commercial success, peaking at number one in France, and charting in the top ten of the United Kingdom, Canada, the United States, Australia, Norway, Japan, Ireland, Hungary, Belgium (Flanders), Slovakia and New Zealand. The accompanying music video takes place in a mall/bowling-alley setting. The video features several cameos such as Drake, Lil Twist and Tinashe, in which Bieber chases after a girl.

The official music video is the sixth most-viewed video all-time on YouTube, and is also, as of 2016, the YouTube video with the most dislikes.It had been the most-viewed from July 12, 2010 until November 24, 2012, when it was surpassed by the music video for "Gangnam Style" by Psy. Bieber performed the song several times, including Saturday Night Live, and the ninth season of American Idol. Bieber also performed an acoustic rendition of the remix version with Drake at the 2010 Juno Awards. The official remix in the United Kingdom features British hip-hop artist Chipmunk.

7.Bailando

"Bailando" (English: "Dancing") is a song by Spanish singer Enrique Iglesias for his tenth studio album Sex and Love (2014). The original Spanish version features the Cuban artists Descemer Bueno and Gente de Zona. The song was written by all of the artists, while production was handled by Carlos Paucar. It was released by Universal Republic Records as the sixth single from the record.

As of 24 August 2014, there are three other versions of the song that have been released to the music market besides the original Spanish version. The Spanglish version features Jamaican singer Sean Paul. Iglesias also released two Portuguese versions of the song: one version of the song in Portuguese destined for Brazilian market with additional vocals by Brazilian singer Luan Santana,and the other Portuguese version destined for the Portuguese market featured the additional vocals of the Portuguese singer Mickael Carreira.

The original Spanish version of "Bailando" served as the theme song of the soap opera Reina de Corazones which aired onTelemundo.According to the IFPI, Bailando was the tenth best-selling song of 2014 with sales of 8 million copies worldwide.

8.Dark Horse

"Dark Horse" is a song recorded by American singer Katy Perry featuring rapper Juicy J. It was originally released on September 17, 2013, by Capitol Records as the first promotional single from Perry's fourth studio album, Prism (2013). Three months later, it was released as the third official single on December 17. Both artists co-wrote the song with its producers, Max Martin, Cirkut, and Dr. Luke, alongside Sarah Hudson. It was conceived by Perry and Hudson during a writing session in Perry's hometown of Santa Barbara, California, and Juicy J was later commissioned for a verse on the song.

"Dark Horse" combines the genres of trap and hip hop, replicating what has been described as a "Southern rap-techno mashup". The track features a minimal production, with a "seductive" and "mature" tone to Perry's vocals, while Juicy J is featured on the song's intro and rapped bridge. Perry, in interviews, said she wanted the song to have a "witchy, spell-y kind of black magic-y idea", so she wrote it from the perspective of a witch warning a man not to fall in love with her because if he does, she will be his last. The song was part of a competition sponsored by Pepsi in which fans could vote via Twitter on whether they would prefer either "Dark Horse" or "Walking on Air" to be released as the first promotional single from Prism.

Upon release, music critics praised the song's experimentation with urban music and Perry's vocals, though were less favorable on Juicy J's contribution to the song. "Dark Horse" has been a commercial success, charting at number one in Canada, the Netherlandsand the United States. It also reached the top ten in almost 20 countries including New Zealand, United Kingdom, Sweden and Venezuela as well as the Digital Songs chart of Billboard magazine. Perry first performed the song live at the 2013 iHeartRadio Music Festival in Las Vegas on September 20, 2013. The song's first major television performance was at the 56th Annual Grammy Awards on January 26, 2014. "Dark Horse" was nominated for Best Pop Duo/Group Performance at the 57th Annual Grammy Awards. The song has sold 13.2 million copies worldwide (including track-equivalent streams), becoming the second best-selling song worldwide for 2014.

9.All About That Bass

"All About That Bass" is the debut single by American singer-songwriter Meghan Trainor. Released by Epic Records on June 30, 2014, it was recorded for her 2014 debut EP and her 2015 studio album, both named Title. Trainor co-wrote "All About That Bass" with its producer Kevin Kadish; it is a bubblegum pop and doo-wop song that draws influences from various musical genres including R&B, hip hop and country. Lyrically, it discusses positive body image.

"All About That Bass" received favorable reviews from music critics for its melody and vintage sound, though some accused Trainor of anti-feminism for its lyrics. It was named one of the best songs of 2014 by several publications and received Grammy Award nominations for Record of the Year and Song of the Year. The song sold 11 million copies worldwide, becoming the fourth best-selling song of 2014 and one of the best-selling singles of all time.

Fatima Robinson directed the song's accompanying music video, a viral online success that was noted for its visuals and lighthearted nature. The song inspired a variety of viral videos and tributes, while Vogue recognized it as part of "the era of the big booty."Trainor has performed it on television and at various concerts, and notable artists have recorded cover versions. Trainor regularly performed the song during her 2015 concert tours, the That Bass Tour and the MTrain Tour.

10.Roar

"Roar" is a song by American singer Katy Perry for her fourth studio album, Prism (2013). It was released as the lead single from the record on August 10, 2013. The song was written by Perry, Bonnie McKee, Dr. Luke, Max Martin, and Cirkut, and produced by the latter three. It is a power pop song, containing elements of glam rock and arena rock, with lyrics centering on standing up for oneself and self-empowerment.

"Roar" received generally mixed reviews from music critics; many appreciated its overall production, while others felt that its lyrical content contained "clichés". The song was a commercial success, becoming Perry's eighth non-consecutive number one song on the U.S. Billboard Hot 100, and also topping charts in Australia, Canada, Ireland, New Zealand, and the United Kingdom. Additionally, it also reached the top five in most international charts, including France, Germany, Italy, Japan and Switzerland.

To promote the song, Perry performed under the Brooklyn Bridge at the closing ceremony of the 2013 MTV Video Music Awards, on The X Factor Australia, at the Sydney Opera House in late October 2013, and on the German TV show Schlag den Raab. Grady Hall and Mark Kudsi directed the song's music video, which features Perry trying to adapt to the jungle where she survived a plane crash, and taming a tiger. It garnered generally mixed reviews from music critics. "Roar" was nominated for Song of the Year and Best Pop Solo Performance at the 56th Annual Grammy Awards. The song topped the charts in 14 countries and sold 9.9 million copies globally (according to the IFPI).