found: Its Chicago V [SR] 1972:label (Chicago)
found: LC data base, 4-8-86(hdg.: Chicago (Musical septet))
found: WWW official site, Nov. 5, 2010(8 members)
found: Wikipedia, Nov. 5, 2010(American rock band formed in 1967 in Chicago, Ill.)
found: All Music, viewed Oct. 3, 2014(Chicago; formed Feb. 15, 1967; Group members: Bill Champlin, Daniel Seraphine, Donnie Dacus, James Pankow, Jason Scheff, Keith Howland, Laudir DeOliveira, Lee Loughnane, Peter Cetera, Robert Lamm, Terry Kath, Tris Imboden, Walter Parazaid) - http://www.allmusic.com/artist/chicago-mn0000110161
found: Wikipedia, March 13, 2018(Chicago; formed in 1967 calling themselves The Big Thing; in June 1968 The Big Thing moved to Los Angeles and changed their name to The Chicago Transit Authority; their self-titled first album Chicago Transit Authority came out in 1969; after that the band's name was shortened to Chicago to avoid legal action from the mass transit company of the same name) - https://en.wikipedia.org/wiki/Chicago_(band)