Question: Who sang lead vocals on 25 or 6 to 4?

Disambiguated questions and answers:
context: An updated version of "25 or 6 to 4" was recorded for the 1986 album "Chicago 18" with James Pankow listed as co-writer, and new band member Jason Scheff on lead vocals. The single reached number 48 on the US chart. This version was also used as the B-side for the band's next single in 1986, "Will You Still Love Me?"
question: Who sang lead vocals on 25 or 6 to 4 for Chicago in 1986?
short_answers: Jason Randolph Scheff
Scheff
Jason Scheff
wikipage: 25 or 6 to 4
context: "25 or 6 to 4" is a song written by American musician Robert Lamm, one of the founding members of the band Chicago. It was recorded in 1969 for their second album "Chicago", with Peter Cetera on lead vocals. The album was released in January 1970 and the song was edited and released as a single in June, climbing to number 4 on the US "Billboard" Hot 100 chart and number 7 on the UK Singles Chart. It was the band's first song to reach the top five in the US. It has been included in numerous Chicago compilation albums. In 2015, Dave Swanson, writing for "Ultimate Classic Rock", listed the song as number one on his top ten list of Chicago songs. "Classic Rock Review" says the song is "one of the most indelible Chicago tunes". In 2019, Bobby Olivier and Andrew Unterberger, music critics for "Billboard" magazine, ranked the song number one on their list of "The 50 Best Chicago Songs".
question: Who originally sang lead vocals on 25 or 6 to 4?
short_answers: Cetera
Peter Cetera
Peter Paul Cetera
wikipage: 25 or 6 to 4
context: Maroulis achieved particular success starring as Drew in the hit Broadway musical "Rock of Ages", featuring the music of 1980s rock legends including Journey, Bon Jovi, and Twisted Sister. The production began running Off-Broadway at the New World Stages in October 2008, moving to Broadway to the Brooks Atkinson Theatre on April 7, 2009. "Rolling Stone" stated that the "play has found a perfect lead in American Idol rocker Constantine Maroulis," while "Associated Press" added that Maroulis "gives a touching performance and sings powerfully as Drew, the young wannabe rock singer." Maroulis' vocal performances were particularly praised, with "The New York Times" describing his voice as "soulful, pure, and intense,"
question: Who sang lead vocals on 25 or 6 to 4 in a 2011 single?
short_answers: Maroulis
Constantine Maroulis
Constantine James Maroulis
wikipage: Constantine Maroulis
context: Carved in Stone is the second solo album by Mötley Crüe frontman Vince Neil. It was released in 1995 on Warner Bros. Records.
question: Who sang lead vocals on 25 or 6 to 4 for Mötley Crüe?
short_answers: Vincent Neil Wharton
Vince Neil
Neil
wikipage: Carved in Stone (Vince Neil album)

Long-form answers:
knowledge: content: "25 or 6 to 4" is a song written by American musician Robert Lamm, one of the founding members of the band Chicago. It was recorded in 1969 for their second album, Chicago, with Peter Cetera on lead vocals.
wikipage: 25 or 6 to 4
content: Maroulis returned to the Idol stage to perform on April 7, 2011, where he debuted his single, "Unchained Melody."[38] At the same time he also released his rendition of Chicago's 25 or 6 to 4, as recorded live at a Night at the Rock Show performance.
wikipage: Constantine Maroulis
content: An updated version of "25 or 6 to 4" was recorded for the 1986 album Chicago 18 with James Pankow listed as co-writer,[17] and new band member Jason Scheff on lead vocals.
wikipage: 25 or 6 to 4
long_answer: "25 or 6 to 4" is a song written by American musician Robert Lamm, one of the founding members of the band Chicago and was recorded in 1969 for their second album, Chicago, with Peter Cetera on lead vocals. An updated version of "25 or 6 to 4" was recorded for the 1986 album Chicago 18 with James Pankow listed as co-writer, and new band member Jason Scheff on lead vocals. In 2011, Constantine Maroulis released his rendition of Chicago's 25 or 6 to 4, as recorded live at a Night at the Rock Show performance. Vince Neil also sang the lead vocals on 25 or 6 to 4 for Mötley Crüe.