<P> `` 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 on July 31 , 1976 . It is also the title of a Chicago compilation album released by Columbia Records ( Columbia 38590 ) in 1983 . </P>
who sings if you leave me now you take away the biggest part of me
Chicago