Peter Paul Cetera Jr. ( sə-TERR-ə; born September 13, 1944) is an American retired musician best known for being a frontman, vocalist, and bassist for the American rock band Chicago from 1967 until his departure in 1985. His career as a recording artist encompasses 17 studio albums with Chicago and eight solo studio albums. As a lead singer/vocal artist he has had four number one songs on the Billboard Hot 100, two during his tenure with Chicago and two during... [more on Wikipedia]