Question: "Glassheart" is a song conceptualised by Leona Lewis and a frequent collaborator who is the lead vocalist for what pop rock band?
Context: "Burn" is a song by English singer Ellie Goulding from "Halcyon Days" (2013), the reissue of her second studio album, "Halcyon" (2012).  The song was written by Ryan Tedder, Goulding, Greg Kurstin, Noel Zancanella and Brent Kutzle, while production was handled by Kurstin and vocal production was done by Tedder.  It was released on 5 July 2013 as the lead single from the reissue.  The song was originally recorded by singer Leona Lewis for her third studio album, "Glassheart" (2012), but it was ultimately scrapped. "Trouble" is a song recorded by British recording artist Leona Lewis and American entertainer Childish Gambino for Lewis' third studio album, "Glassheart" (2012).  Inspired by Lewis' break-up with childhood sweetheart Lou Al-Chamaa, "Trouble" is a mid-tempo R&B and trip hop ballad, with a piano and strings-driven melody.  It was written by a British writing collective consisting of Lewis, Donald Glover, Hugo Chegwin, Harry Craze, Shahid Khan, James Murray, Mustafa Omer, Emeli Sandé and Fraser T Smith.  Production came courtesy of Khan under his production name of Naughty Boy and Smith, along with co-producer Chris Loco and additional producer Jahlil Beats.  Music critics noted that the urban production marked a new direction for Lewis, particularly by featuring Gambino during the song's middle eight breakdown with a poetic rap verse.  A version excluding Gambino is also included on "Glassheart". Ryan Benjamin Tedder (born June 26, 1979) is an American singer, songwriter, musician, multi-instrumentalist, and record producer.  As well as being the lead vocalist for the pop rock band OneRepublic, he has an independent career as a songwriter and producer for various artists, including Madonna, U2, Adele, Beyoncé, Maroon 5, Demi Lovato, Ariana Grande, Kelly Clarkson, Jennifer Lopez, Westlife, Ed Sheeran, One Direction, Big Time Rush, Camila Cabello, Taylor Swift, Leona Lewis, Zedd and MØ. "I Am" is a song by British singer and songwriter Leona Lewis from her fifth studio album, "I Am" (2015).  The song was written by Lewis, Toby Gad and Eg White, with Gad and White producing it.  Lyrically, "I Am" is about the feelings and emotions experienced by Lewis following her departure from her former record label Syco and its boss, Simon Cowell.  It is a dance-influenced track which makes use of strings, piano and drums as part of its instrumentation.  Its composition garnered comparisons to singers Avril Lavigne and Massive Attack.  Island released "I Am" on 17 July 2015 as the lead single for the United Kingdom, but it is the second single to be released from the album overall.  Remixes by Fastlane and DEVolution were also released.  The track garnered a positive response from music critics, many of whom praised Lewis' strong and emotive vocal performance and described it as a standout on the album.  Lewis has performed the song live on "" and at the BBC's Radio 2 Live in Hyde Park festival. "Lovebird" is a song recorded by British singer-songwriter Leona Lewis for her third studio album "Glassheart" (2012).  It was written by Bonnie McKee, Joshua Coleman and Dr. Luke, and produced by Josh Abrahams, Ammo and Oligee.  "Lovebird" was recorded at Pulse Recording in Los Angeles and is a power ballad, incorporating a piano and synth-driven melody.  The lyrics consist of Lewis informing her past lover that enough time has passed since their relationship for her to have moved on and to have developed as a person.  Critics praised Lewis' vocal performance, likening her technical abilities to those of Mariah Carey and Whitney Houston.  The musical structure of the song was heavily compared to one of her previous singles, "Bleeding Love", along with songs performed by Adele.  The accompanying music video shows Lewis trying to escape from a giant bird cage. "Collide" is a song performed by British recording artist Leona Lewis and Swedish DJ and record producer Avicii.  It was written by Tim Berg, Simon Jeffes, Arash Pournouri, Autumn Rowe, Sandy Wilhelm, with production helmed by Wilhelm under his production name Sandy Vee and The Young Boys.  "Collide" is a house inspired love song, that's instrumentation consists of piano riffs and a guitar.  The song was recorded for Lewis' third studio album "Glassheart", but was not included on the album's final track listing. Listen is the sixth studio album by French DJ and record producer David Guetta.  It was released on 21 November 2014.  It features collaborations with artists from the R&B, hip hop, alternative rock and pop worlds such as Sam Martin, Emeli Sandé, The Script, Nicki Minaj, John Legend, Nico & Vinz, Ryan Tedder (the lead singer of pop rock band OneRepublic), Sia, Magic! , Bebe Rexha, South African male choral group Ladysmith Black Mambazo, Ms. Dynamite, Elliphant, Birdy, Jaymes Young, Sonny Wilson, Vassy, and Skylar Grey.  It also features additional production from Guetta's frequent collaborator Giorgio Tuinfort, Avicii, Afrojack, Nicky Romero, Showtek, and Stadiumx among others, with additional writing credits from Austin Bisnow, Jason Evigan, Julie Frost, and The-Dream among others. Travis Landon Barker (born November 14, 1975) is an American musician and producer, best known as the drummer for the rock band Blink-182.  Barker has also performed as a frequent collaborator with hip hop artists, is a member of the rap rock group Transplants, founded the rock bands +44 and Box Car Racer, and most recently joined Antemasque and Goldfinger.  He was a frequent collaborator with the late DJ AM, and together they formed TRV$DJAM.  Due to his fame, "Rolling Stone" referred to him as "punk's first superstar drummer." "Glassheart" is a song recorded by British singer-songwriter Leona Lewis for her third studio album of the same name (2012).  The song was conceptualised by Lewis and frequent collaborator Ryan Tedder at his family home in Denver, Colorado.  As she was experiencing a stressful time in her life, Lewis wanted to create an uptempo dance track with Tedder as she felt a ballad would make her more upset.  It was co-written by Lewis and Tedder alongside Brent Kutzle, Noel Zancanella, Justin Franks, Fis Shkreli and Peter Svensson.  Production of the song was handled by Tedder and Franks, with the latter credited under his production alias DJ Frank E.  It was co-produced by Zancanella, Kutzle and Shkreli. Hurt: The EP is the first EP by British singer-songwriter Leona Lewis.  It was released on 9 December 2011 by Syco Music and RCA Records.  The EP served as something to bridge the gap for her fans whilst she finished recording her third studio album "Glassheart" (2012).  The album was supposed to be released in November 2011, but was delayed to March 2012, and again to November 2012.  Lewis's reason for delaying the album was because after she met producer Fraser T Smith, the singer wanted to collaborate on new material for possible inclusion on "Glassheart".  As a result, Smith also produced "Hurt: The EP".  The EP consists of three cover versions: "Hurt" by Nine Inch Nails; "Iris" by the Goo Goo Dolls and "Colorblind" by Counting Crows.  Musically, the songs are influenced by rock music, whilst the lyrics revolve around feeling pain.
Answer: OneRepublic