Peter Cetera is an American singer, songwriter, and bassist, best known for being a founding member of the rock band Chicago. His distinctive tenor voice and melodic songwriting contributed significantly to the band's success, especially on hits like "If You Leave Me Now" and "Hard to Say I'm Sorry". After leaving Chicago in 1985, Cetera pursued a successful solo career, further establishing his soft rock style with hits like "Glory of Love". His music is characterized by its romantic themes, strong melodies, and the use of both rock and jazz elements.