"Want U Back" is a song by English singer Cher Lloyd from her debut studio album, "Sticks and Stones" (2011).
 It was released as the third and final single from the album on 17 February 2012, and it was released as the lead single from the US version of the album on 22 May 2012.
 The UK single release features guest vocals from "The X Factor US" contestant Astro.
 In the United States the song was released as a solo single, without Astro's verses.
 Its remix features Snoop Dogg.
 The song was written by Savan Kotecha and Shellback, with production being handled by the latter.
 Musically, "Want U Back" is a dance-pop song, with elements of bubblegum and synthpop, while lyrically the song is about a girl who's jealous of her ex-boyfriend's new relationship, and tries to sabotage the new relationship.
George "Corpsegrinder" Fisher (born July 8, 1969) is an American extreme metal vocalist for the American death metal band Cannibal Corpse, the lesser-known melodic death metal band Paths of Possession, and the lesser-known extreme metal supergroup Serpentine Dominion.
 He recorded two albums with Florida's Monstrosity before leaving and joining Cannibal Corpse in late 1995, replacing vocalist Chris Barnes, who is now the vocalist for Six Feet Under.
 He also provided guest vocals for New York technical death metal band Suffocation on the songs "Reincremation" and "Mass Obliteration" from their debut album, "Effigy of the Forgotten", as well as guest vocals for California deathcore band Suicide Silence on the song "Control" from their fourth album, "You Can't Stop Me".
 Fisher also performed guest vocals on Job for a Cowboy's 2014 album "Sun Eater" on the song "The Synthetic Sea."
 As a death metal vocalist, Fisher employs the "death growl" extended vocal technique.
"What Have You Done" is the first single from Dutch symphonic metal/rock band Within Temptation's fourth studio album "The Heart of Everything" (2007).
 The song features guest vocals from Life of Agony's lead singer Mina Caputo (then known as Keith Caputo) and it was released as the album's first single in early 2007 (see 2007 in music).
 It became their first charting single in Canada and in the United States.
 A new edit/version of the song was released in the U.S. through iTunes on 26 June 2007.
Get Stoked on It!
 is the debut studio album by American rock band The Wonder Years, released through No Sleep Records on October 30, 2007.
 The album features guest vocals from Rachel Minton (Zolof the Rock & Roll Destroyer), Bob Wilson (Letxdown), and Brooke Schwartz (CDC).
 No Sleep released a digital-only reissue of the album on May 15, 2012.
 The album was remixed, remastered and given a new cover.
 Commenting on the re-release, lead singer Dan Campbell described the original as a "train wreck", but said since the remaster had been paid for its release was "inevitable".
 He said about the album, "If you like the record, enjoy the new mixes.
 If you hate the record, I'm on your side."
"Remember Me" is the first single by English singer Daley taken from his second EP, "Alone Together".
 It was released on 9 December 2012 through Levels/Polydor/Universal Republic Records.
 The song features guest vocals from English singer-songwriter Jessie J.
 Produced by The White N3rd and Balistiq, it samples Blue Boy's song of the same name.
"Sunlight" is a song by Belgian producer The Magician which features guest vocals from Olly Alexander of the English synthpop band Years & Years.
 The song was released in the United Kingdom as a digital download on 28 September 2014.
 The song was written by Stephen Fasano, Olly Alexander, and Mark Ralph.
 The song was used in the 2015 film "We Are Your Friends".
"Helele" is a song by South African singer Velile Mchunu and Danish percussion duo Safri Duo.
 It was released on 7 May 2010 as the only new single from Safri Duo's "Greatest Hits" album.
 The song was the official trailer song for the 2010 FIFA World Cup broadcast on German television channel RTL and Switzerland's Schweizer Fernsehen and Télévision Suisse Romande in June–July.
 "Helele" is based on the 1971 song "Aieaoa" by French producer Daniel Vangarde and Belgian producer Jean Kluger in the group Yamasuki.
 It was famously covered by Belgian group Black Blood in 1975 and English girl group Bananarama in 1981.
 "Helele" peaked at number one in Switzerland, number two in Germany and number eight in Austria.
Olly Alexander (born Oliver Alexander Thornton, 15 July 1990), is an English singer, songwriter and actor.
 He is the lead singer of the band Years & Years.
"Differently" is a song recorded by Australian pop singer, Cassie Davis.
 It is the second single taken off of Cassie's upcoming debut album of the same title.
 It features guest vocals from Travie McCoy, the lead singer of American alternative hip hop band, Gym Class Heroes.
 Signed copies of the single are available if pre-ordered at Sanity or JB Hi-Fi.
 The song went Gold on 18 September 2009 confirmed via her Twitter page
"Right Round" is a song performed by American singer/rapper Flo Rida.
 It was released as the lead single from his second studio album, "R.O.O.T.S." (2009).
 The song features guest vocals from American singer Kesha.
 It was released to radio on 27 January 2009 and was digitally released on 10 February by Poe Boy Entertainment and Atlantic Records.
 The song heavily samples the chorus of the 1984 Dead or Alive song "You Spin Me Round (Like a Record)" in its hook.
 According to one of the song's writers, the chorus refers to oral sex.
 Kesha contributed guest vocals to the song, but was uncredited in the United States and Canada during the run atop the charts.

Question: The song "Sunlight" by Belgian producer The Magician features guest vocals by which English singer who also is the lead singer of the band Years & Years?
Answer: Olly Alexander