Question: Are Jens Kidman and Nate Ruess both lead vocalists?

full_context: Document 1: Fun (band): Fun (stylized as fun.) is an American pop rock band based in New York City. The band was formed by Nate Ruess (former lead singer of The Format), with Andrew Dost (of Anathallo), and Jack Antonoff (of Steel Train and Bleachers). Fun has released two albums: "Aim and Ignite" in August 2009 and "Some Nights" in February 2012.
Document 2: King Diamond: Kim Bendix Petersen (born 14 June 1956), better known by his stage name King Diamond, is a Danish heavy metal musician. As a vocalist, he is known for his extensive vocal range, in particular his usage of falsetto. He is the lead vocalist for both Mercyful Fate and the eponymous King Diamond.
Document 3: 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 4: Fun discography: The discography of American indie pop band Fun consists of two studio albums, seven extended plays, 11 singles and seven music videos. Following the split of his previous band The Format, lead singer Nate Ruess formed Fun in 2008 with musicians Andrew Dost and Jack Antonoff, both of whom had previously toured with The Format. Fun began recording sessions for their debut album in September 2008 and embarked on a North American tour the following month. In May 2009, they issued their debut single, "At Least I'm Not as Sad (As I Used to Be)". "Aim and Ignite", the band's first full-length album, was released by Nettwerk Records on August 25, 2009 and peaked at number 71 on the United States "Billboard" 200 chart. The album produced an additional two singles, "All the Pretty Girls" and "Walking the Dog", which were then followed by the release of the single "C'mon", a collaboration with American alternative rock band Panic! at the Disco.
Document 5: Grand Romantic: Grand Romantic is the debut studio album of Nate Ruess, lead vocalist from The Format and Fun. It was released on June 16, 2015, by Fueled By Ramen. The album was produced by Some Nights producer Jeff Bhasker. Following the hiatus of Fun, Ruess announced that he would be working on material for a solo project.
Document 6: Jens Bogren: Jens Peter Daniel Bogren is a record producer, mixer and recording engineer who has worked on albums by Opeth, Dimmu Borgir, Sepultura, Arch Enemy, At The Gates, Katatonia, Babymetal, Soilwork, James LaBrie, Moonspell, God Forbid, Kreator, Devin Townsend, Ihsahn, Dark Tranquillity, Paradise Lost, Amon Amarth, Dragonforce, The Ocean, Haken, Rotting Christ, Symphony X, Myrath, Angra and Dir En Grey amongst others. Bogren lives in Örebro, Sweden and is based at Fascination Street Studios.
Document 7: Tyler Joseph: Tyler Robert Joseph (born December 1, 1988) is an American singer, songwriter, multi-instrumentalist, record producer, and rapper. He is the lead vocalist for the musical duo Twenty One Pilots.
Document 8: Jonathan Davis: Jonathan Howsmon Davis (born January 18, 1971), also known as JD and JDevil (or J Devil), is an American musician best known as the leading vocalist and frontman of the nu metal band Korn.
Document 9: Jens Kidman: Jens Kidman (born 8 June 1966) is a Swedish metal vocalist. He is best known for being the lead vocalist for the Swedish extreme metal band Meshuggah. He is famous for his very aggressive shouts and screams and for his unique stage presence.
Document 10: Some Nights (song): "Some Nights" is a song by American indie pop band Fun. It was released on June 4, 2012, as the second single from their second studio album of the same name. The song was written by Jeff Bhasker, Nate Ruess, Andrew Dost, and Jack Antonoff. Musically "Some Nights" is an indie pop song with elements of power pop and afrobeat while the lyrics depict the protagonist having an existential crisis.
Document 11: The Format: The Format was an American indie rock band formed by Nate Ruess and Sam Means. The band announced a hiatus on February 4, 2008. Their style can be considered a mixture of indie, alternative, punk and folk music, with elements of 1960s and 1970s pop music. Though Means and Ruess are the foremost members of the band, they have played, toured, and recorded with Mike Schey, Mark Buzard, Don Raymond, and—for the DVD recording and summer 2007 tour—The Honorary Title's current drummer and The Format alumnus Adam Boyd. The Format chose their name to make fun of the music industry's inclination towards a cookie-cutter "format" for a hit.
Document 12: Tomas Haake: Tomas Haake (born 13 July 1971) is a Swedish drummer and main songwriter of the extreme metal band Meshuggah. He is known for his polyrhythms and technical ability. In 2012, Haake was named the 5th best Modern Metal drummer by MetalSucks.net. In the July 2008 edition of "Modern Drummer" magazine, Haake was named the number one drummer in the "Metal" category, as decided upon in the magazine's Readers' Poll.
Document 13: Michael Jagmin: Michael "Jag" Jagmin is an American vocalist, notable for being the former lead vocalist of post-hardcore band A Skylit Drive and former lead vocalist of metal band Odd Project. Jagmin is well known for the idiosyncratic quality of his voice and possesses a wide vocal range spanning over three octaves, and the ability of making high pitched screams.
Document 14: Nate Ruess: Nathaniel Joseph Ruess (born February 26, 1982) is an American singer and songwriter. He is the lead singer of the indie pop band Fun., and previously of The Format. As of 2015, he also performs as a solo musician.
Document 15: Jim Berger (singer): Jim Berger (born 19 May 1974) is a Swedish black metal singer who goes by the stage name All. His original project was Abruptum. He also performed in many side projects, including Ophthalamia, Vondur and War, usually with Tony Särkkä.
ground_truth: yes