Hugely successful jazz-rock then soft-rock American band formed in the late 60s.

Current lineup features original members Robert Lamm, James Pankow, Lee Loughnane and Walter Parazaider as well as later additions (1981-onwards): Jason Scheff, Tris Imboden, Keith Howland, Drew Hester and Lou Pardini. Peter Cetera was a previous band member.

Key songs include "25 or 6 to 4", "If You Leave Me Now", "Hard To Say I'm Sorry" and "Hard Habit To Break".

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