Peter Paul Cetera (born September 13; 1944 in Chicago; Illinois; U.S.) is an American singer; songwriter; bass guitar player and producer best known for being an original member of the rock band Chicago; before launching a successful solo career.In 1989; Cetera recorded yet another duet; this time with Cher; called After All; which was included on the soundtrack of the movie Chances Are. It reached #6 on the US charts. "If You Leave Me Now" is the title of a popular hit ballad by the American rock group Chicago, from their album Chicago X. It was written and sung by bass guitar player Peter Cetera and released as a single in July 1976.
It is also the title of a compilation album released by Columbia Records (Columbia 38590) in 1983.
The single topped the US charts on October 23, 1976 and stayed there for two weeks, making it the first number one hit for the group. It also reached the number one spot in the UK, maintaining the position for three weeks. It was popular in multiple radio formats, and at one point during its peak listeners could hear it being played simultaneously on four different New York City radio stations.
"If You Leave Me.