Question: On which reality TV Show did Maroon 5's lead singer appear as a judge?

full_context: Document 1: Case (album): Case is the self-titled debut album by American R&B singer-songwriter Case. It was released on August 13, 1996. It features the hit single "Touch Me, Tease Me" featuring rapper Foxy Brown and Mary J. Blige. The album peaked at number seven on the R&B albums chart and reached number forty-two on the "Billboard" 200. Mary J. Blige (Case's girlfriend at the time) co-wrote the majority of his debut album.
Document 2: Amanda Ayala: Amanda Ayala is an American singer from New York who made her first appearance on the national scene on NBC's Emmy Award-winning show "The Voice." Her first performance on the show was a rendition of Mississippi Queen by Mountain (band). Three out of the four judges on the panel turned their chairs for Amanda, including Pharrell Williams, Blake Shelton and Adam Levine. Ayala chose to join Team Adam where she was mentored by John Fogerty. Amanda also performed a rendition of Edge of Seventeen by Stevie Nicks. Both of Ayala's singles charted on the iTunes Rock Charts. Her performances garnered attention from stars like Brad Paisley and Leslie West via Twitter. Her audition video has over 1.2 million views and counting.
Document 3: Sad (Maroon 5 song): "Sad" is the ninth track from American band Maroon 5's fourth studio album "Overexposed" (2012). It was written by Adam Levine and James Valentine; they produced the song together with Noah "Mailbox" Passovoy. Valentine started composing the song on his home piano, before introducing the melody to Levine, who wrote the lyrics and called the song his most personal track on the album. "Sad" is a piano ballad that is similar to the music of British singer-songwriter Adele. It received generally mixed reviews from music critics; some of them called it a standout track on "Overexposed", however, others criticized Levine's voice on the song. Following the release of the album, due to strong digital downloads, the song peaked at number 12 on the singles chart in South Korea.
Document 4: Adam Leonard (singer-songwriter): Adam Leonard is an English singer-songwriter working mainly in the folk, psychedelic and electronic music fields. His style is often described as lo-fi and the subject matter of his songs somewhat unconventional. Since his debut album 'How Music Sounds' in 2003, he has released many EPs, albums and mini-albums on various small labels. Live performances, which have so far been limited to the UK (Manchester, London and Northern Ireland) are as intriguing as they are rare. In 2008 he opened for British folk legend Steve Ashley. He regularly collaborates with other musicians, most notably Pat Gubler (P.G. Six), Ashley Cooke (Pulco), Gareth Davies, and Steven Collins of The Owl Service, a band for which Leonard provided vocals for their 2010 album 'The View From A Hill'. At the close of 2010, a limited edition album entitled 'Nature Recordings' was released on vinyl only by the London label The Great Pop Supplement. In 2011 Leonard provided the soundtrack to Claudia Heindel's award-winning independent film Lucky Seven. In 2012, Nature Recordings was issued on CD by Manchester-based label The Northwestern Series.
Document 5: Casey Weston: Casey Weston (born December 4, 1992) is a singer-songwriter. She was one of the top two finalists on Adam Levine's team on the first season of "The Voice." One of her recordings from "The Voice" made number 90 on the "Billboard" Hot 100.
Document 6: Neko Case: Neko Richelle Case ( ; born September 8, 1970) is an American singer-songwriter, best known for her solo career and her contributions as a member of the Canadian indie rock group The New Pornographers.
Document 7: Jeffery Austin: Jeffery Austin McClelland, Jr. (born April 15, 1991), better known by his stage name Jeffery Austin, is an American pop musician and was a contestant on the ninth season of The Voice, turning a single chair and defaulting to be a member of Gwen Stefani's team. He eventually finished in fourth place, behind Jordan Smith, Emily Ann Roberts, and Barrett Baber. His compilation album, "The Voice: The Complete Season 9 Collection", placed on the "Billboard" magazine charts.
Document 8: Adam Duritz: Adam Fredric Duritz (born August 1, 1964) is an American musician, songwriter, record producer, and film producer. He is best known for his role as frontman and vocalist for the rock band Counting Crows, of which he is a founding member and principal composer of their catalog of songs.
Document 9: Adam Lambert: Adam Mitchel Lambert (born January 29, 1982) is an American singer, songwriter and stage actor. Since 2009, he has sold over 3 million albums and 5 million singles worldwide.
Document 10: Adam Levine: Adam Noah Levine (born March 18, 1979) is an American singer, songwriter, multi-instrumentalist, actor, and record producer. He is the lead singer for the pop rock band Maroon 5.
Document 11: On the Way Down: "On the Way Down" is the debut single by Ryan Cabrera, released from his 2004 studio album, "Take It All Away". The song won a 2006 ASCAP Pop Award for most performed song of that year. The song was co-written with Curtis Frasca and Sabelle Breer who also helped create hit songs for Stacie Orrico and Avril Lavigne. It reached number one on airplay charts and peaked at number 15 on the "Billboard" Hot 100 on October 5, 2004. Backup vocals on this track are done by John Rzeznik member of The Goo Goo Dolls.
Document 12: List of The Voice UK finalists (series 1): The first series of the talent show The Voice UK began broadcasting on 24 March 2012. The coaches are Tom Jones, Jessie J, Danny O'Donoghue of The Script and will.i.am of The Black Eyed Peas. Each coach chose who they wanted on their team by pressing their "I Want You" button. When one or more coaches turned around, the contestant chose which team he or she wanted to join. If none of the coaches pressed their button by the end of the contestant's song, all four coaches turned around to give advice to the contestant who would not progress in the show. The show was won by Leanne Mitchell, mentored by Tom Jones, who took the £100,000 and record deal with Universal Republic Records, with Tyler James and Bo Bruce becoming the joint runners-up (mentored by will.i.am and Danny O'Donoghue respectively). Vince Kidd, mentored by Jessie J took fourth place.
Document 13: Adam Bravin: Adam Michael Bravin, also known as DJ Adam 12, is a musician and producer who is half of the darkwave duo She Wants Revenge. He has also played in Crazy Town from 1995 to 1996, prior to DJ AM. After She Wants Revenge, Bravin started working on his own solo project, Love Ecstasy Terror. He has also been the personal DJ for President Barack Obama.
Document 14: Mandy Moore: Amanda Leigh Moore (born April 10, 1984) is an American singer/songwriter and actress. After coming to prominence with her debut single "Candy", which peaked at number 41 on the "Billboard" Hot 100, Moore signed with Epic Records. Her debut studio album, "So Real" (1999), went on to receive a Platinum certification from the RIAA. Her 2000 single "I Wanna Be with You", from her second studio album of the same name, became Moore's first Top 30 song in the United States, peaking at number 24 on the Billboard Hot 100. Her subsequent studio albums, the eponymous "Mandy Moore" (2001), "Coverage" (2003), "Wild Hope" (2007) and "Amanda Leigh" (2009), have seen continued success. As of 2009, "Billboard" reported that Moore has sold more than 10 million albums worldwide, and in 2012 she was ranked #96 on VH1's list of "100 Greatest Women in Music" as well as #63 on their "Sexiest Artists of All Time List".
Document 15: Adam Lazzara: Adam Burbank Lazzara (born September 22, 1981) is an American singer, songwriter and musician. He is lead singer of the rock band Taking Back Sunday. Along with singing lead vocals, Lazzara plays guitar and occasionally the harmonica.
ground_truth: The Voice