Chicago consists of Peter Cetera.
Chicago is a rock band that was formed in 1967 in Chicago, Illinois. Well known for being one of the first (and, indeed, one of the few) rock bands to make extensive use of horns, Chicago started as a politically-charged, sometimes experimental rock band and later moved to a softer sound and became famous for producing a number of hit ballads. They had a steady stream of hits throughout the 1970s and 1980s.
The band was formed when a group of DePaul University music students began playing a series of late-night jams at clubs on and off campus. They added more members, eventually growing to seven players, and went professional as a cover band called The Big Thing. The band featured an unusual and unusually versatile line-up of instrumentalists, including saxophonist Walter Parazaider, trombonist James Pankow, and trumpet player Lee Loughnane, along with more traditional rock instruments -- guitarist Terry Kath, keyboardist Robert Lamm, drummer Danny Seraphine, and bassist Peter Cetera (who was the last to join the original group). While gaining some success as a cover band, the group worked on original songs and, in 1968, moved to Los Angeles, California under the guidance of their friend and manager James William Guercio, and signed with Columbia Records. Upon release of their first record in early 1969, the band took a new name, Chicago Transit Authority.
The band's first album, the eponymously titled The Chicago Transit Authority, was an audacious debut: a sprawling double album (unheard of for a rookie band) that included jazzy instrumentals, extended jams featuring Latin percussion, and experimental, feedback-laden guitar abstraction. The album began to receive heavy airplay on the fledgling FM radio band; it included a number of pop-rock gems — "Does Anybody Really Know What Time It Is?", "Beginnings", and "Questions 67 and 68" — which would later be edited to a radio-friendly length, released as singles, and eventually become rock radio staples.