Claim: Peter Cetera was a vocalist.
Evidence: Peter Paul Cetera -LRB- -LSB- səˈtɛrə -RSB- ; born September 13 , 1944 -RRB- is an American singer , songwriter , and bassist best known for being an original member of the rock band Chicago -LRB- 1967 -- 1985 -RRB- , before launching a successful solo career.