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One Direction, often shortened to 1D, are an English-Irish pop boy band formed in London in 2010. The group is composed of Niall Horan, Liam Payne, Harry Styles, Louis Tomlinson, and previously Zayn Malik until his departure from the group in March 2015. The group signed with Simon Cowell's record label Syco Records after forming and finishing third in the seventh series of the British televised singing competition The X Factor in 2010.

Alex & Sierra were an American duo consisting of Alex Kinsey (born September 8, 1991) and Sierra Deaton (born February 11, 1991), who won the third and final season of The X Factor US. They were mentored by Simon Cowell. Their debut album It's About Us was released on October 7, 2014, on Columbia Records. Their EP As Seen on TV was released on September 30, 2016.

On September 1, 2017, Alex & Sierra announced to the media that they had broken up more than a year earlier, and would no longer continue to make music together, but would branch out into their own solo careers.

Alex & Sierra auditioned in New Orleans, Louisiana, making it to the next round after wowing the judges with a sultry version of Britney Spears' "Toxic". They continued on to the top 40 and received Simon Cowell as their mentor. For the Four Chair Challenge, Alex & Sierra took on the John Travolta/Olivia Newton-John classic "You're The One That I Want" from the 1978 musical film Grease. The judges praised the duo for putting their own twist on the song. Kelly and Paulina felt the performance was "nice" and said they had "sexiness" to them, while Demi Lovato told them they were one of their favorite acts but questioned the future and their relationship. Despite this controversy, the duo made it through to the live shows.

Fifth Harmony, often shortened to 5H, are an American girl group based in Miami, composed of Ally Brooke, Normani, Dinah Jane, Lauren Jauregui, and previously Camila Cabello until her departure from the group in December 2016. The group signed a joint record deal with Simon Cowell's label Syco Records and L.A. Reid's label Epic Records after forming and finishing third in the second season of the American singing competition series The X Factor in 2012.

The group released their debut single "Miss Movin' On", preceding their extended play Better Together. In 2015, The group released their debut studio album Reflection, which was certified gold by the Recording Industry Association of America (RIAA). It spawned the singles "Boss", "Sledgehammer" and "Worth It"; the latter of which was certified 3x Platinum by RIAA, and reached the top ten in thirteen countries. In 2016, the group released "Work from Home", the lead single from their second album 7/27, which peaked at number four on the Billboard Hot 100, making it the first top five single by a girl group in a decade on that chart. They released their self-titled third album in 2017. The group went on indefinite hiatus in March 2018, allowing its members to pursue solo projects.

Zain Javadd Malik, known mononymously as Zayn, is a British singer. Zayn auditioned as a solo contestant for the British music competition television series The X Factor in 2010. After being eliminated, he was brought back to the competition to form the five-piece boy band One Direction, which went on to become one of the best-selling boy bands of all time. He left the group in March 2015 and signed a solo recording contract with RCA Records.

Miley Ray Cyrus is an American singer, songwriter, and actress. Her music spans across varied styles and genres, including pop, country, rock, hip hop, R&B, and experimental music.

Louis William Tomlinson (; born Louis Troy Austin; 24 December 1991) is an English singer and songwriter. He rose to fame as a member of the boy band One Direction. Tomlinson began his career appearing in television dramas before he auditioned on the British music competition series The X Factor in 2010. After being eliminated as a solo performer, he was placed into a group with four other contestants, forming One Direction. One Direction went on to become one of the best-selling boy bands of all time.

Following the group's hiatus in 2016, Tomlinson released "Just Hold On" as a debut solo single in December 2016. It peaked at number two on the UK Singles Chart and was certified platinum in the UK. In 2017, Tomlinson released "Back to You" with American singer Bebe Rexha (which was certified platinum in the USA and the UK) and "Miss You". In the same year, he appeared on Debrett's 2017 list of the most influential people in the UK.

Justin Drew Bieber is a Canadian singer. Bieber is recognized for his genre-melding musicianship and global influence in modern-day popular music. He was discovered by American record executive Scooter Braun and signed with RBMG Records in 2008, gaining recognition with the release of his debut seven-track EP My World (2009) and soon establishing himself as a teen idol.

Unbroken is the third studio album by American singer Demi Lovato. It was released on September 20, 2011, by Hollywood Records. Primarily a pop record, Lovato described the album as "more mature" and with more R&B elements than her previous material, citing Rihanna as the major influence. While some of the album's lyrical content was heavily influenced by Lovato's personal struggles, it also deals with lighter subjects, such as love, self-empowerment, and having fun. Contributions to the album's production came from a wide range of producers, including Toby Gad, Ryan Tedder, Timbaland, Jim Beanz and Rock Mafia.

Nicholas Jerry Jonas (born September 16, 1992) is an American singer, songwriter and actor. Jonas began acting on Broadway at the age of seven, and released his debut single in 2002; this caught the attention of Columbia Records, where Jonas formed a band with his older brothers, Kevin and Joe, known as the Jonas Brothers. The group released their debut studio album, It's About Time, through the Columbia label in 2006. After leaving Columbia Records and signing with Hollywood Records, the group released their self-titled second studio album in 2007, which became their breakthrough record. The band became prominent figures on the Disney Channel during this time, gaining a large following through the network, and appeared in the widely successful musical television film Camp Rock (2008) and its sequel Camp Rock 2: The Final Jam (2010), as well as two of their own series, Jonas Brothers: Living the Dream (2008–2010) and Jonas (2009–2010).

Shawn Peter Raul Mendes is a Canadian pop singer-songwriter. He gained a following in 2013, when he posted song covers on the video sharing platform Vine. The following year, he caught the attention of artist manager Andrew Gertler and Island Records A&R Ziggy Chareton, which led to him signing a deal with the record label. Mendes' self-titled debut EP was released in 2014, followed by his debut studio album Handwritten in 2015. Handwritten debuted atop the US Billboard 200, making Mendes one of five artists ever to debut at number one before the age of 18. The single "Stitches" reached number one in the UK and the top 10 in the US and Canada.

Carly Rae Jepsen is a Canadian singer and songwriter. After studying musical theatre for most of her school life and while in university, Jepsen garnered mainstream attention after placing third on the fifth season of Canadian Idol in 2007. In 2008, Jepsen released her folk-influenced debut studio album Tug of War in Canada before it was internationally released in 2011.

"I Hate U, I Love U" is a song by American singer and rapper Gnash featuring American singer Olivia O'Brien. It was released on July 26, 2015, as the first single from Gnash's third extended play, Us (2016). The song peaked at number ten on the Billboard Hot 100. Outside of the United States, "I Hate U, I Love U" topped the charts in Australia, a first for both Gnash and O'Brien, and peaked within the top ten of the charts in Austria, Belgium, Finland, Norway, and the United Kingdom.

Troye Sivan Mellet is an Australian singer-songwriter, actor and YouTuber. After gaining popularity as a singer on YouTube and in Australian talent competitions, Sivan signed with EMI Australia in 2013 and released his third extended play, TRXYE (2014), which peaked at number five on the US Billboard 200. Its lead single, "Happy Little Pill", reached number ten on Australian music charts. In 2015, he released his fourth extended play Wild followed by his debut studio album Blue Neighbourhood, whose lead single "Youth" became Sivan's first single to enter the top 40 of the Billboard Hot 100 chart, peaking at number 23. His second studio album Bloom (2018) reached number three in Australia, and number four on the Billboard 200 chart. Its lead single, "My My My!", became Sivan's second number-one single on the Billboard Dance Club Songs chart. In 2020, his EP In a Dream was released.

Katheryn Elizabeth Hudson, known professionally as Katy Perry, is an American singer, songwriter, and television personality. Known for her influence on modern pop music and her campy style, she has been referred to as the "Queen of Camp" by Vogue. Pursuing a career in gospel music at 16, Perry released her debut album, Katy Hudson, under Red Hill Records in 2001, which was commercially unsuccessful. She moved to Los Angeles at 17 to venture into secular music, and later adopted the stage name "Katy Perry" from her mother's maiden name. She recorded an album while signed to Columbia Records, but was dropped before signing to Capitol Records.

5 Seconds of Summer, often shortened to 5SOS, are an Australian pop rock band from Sydney, New South Wales, formed in late 2011. The group consists of lead vocalist and rhythm guitarist Luke Hemmings, lead guitarist Michael Clifford, bassist Calum Hood, and drummer Ashton Irwin. Originally beginning their career as YouTube celebrities, they rose to international fame while touring with English-Irish boy band One Direction on their Take Me Home Tour. Since 2014, 5 Seconds of Summer have sold more than 10 million albums, sold over 2 million concert tickets worldwide, and the band's songs streams surpass 7 billion, making them one of the most successful Australian musical acts in history.

Selena Marie Gomez is an American singer, actress, and producer. Gomez began her acting career on the children's television series Barney & Friends (2002–2004). As a teenager, she rose to prominence for starring as Alex Russo on the Disney Channel television series Wizards of Waverly Place (2007–2012). Alongside her television career, Gomez appeared in the films Another Cinderella Story (2008), Wizards of Waverly Place: The Movie (2009), Ramona and Beezus (2010), Monte Carlo (2011), Spring Breakers (2012), Neighbors 2: Sorority Rising (2016), and The Dead Don't Die (2019), and voiced Mavis in the Hotel Transylvania film franchise (2012–2022).

Charles Otto Puth Jr. is an American singer, songwriter, and record producer. His initial exposure came through the viral success of his song videos uploaded to YouTube. Puth signed with the record label eleveneleven in 2011 after performing on The Ellen DeGeneres Show, while songwriting and producing material for other artists.

Alessia Caracciolo, known professionally as Alessia Cara, is a Canadian singer-songwriter. Born in Mississauga, Canada, to Italian parents, she began posting covers of songs on YouTube at age 13. After uploading acoustic covers of songs such as "Love Yourself" and "Sweater Weather" online, she signed with EP Entertainment and Def Jam Recordings in 2014 and released her debut single, "Here", the following year. It peaked at number 19 on the Canadian Hot 100 chart and was a sleeper hit in the US, peaking at number 5 on the Billboard Hot 100 chart.