The Sons of Champlin is an American rock band formed in the 1960s by Bill Champlin, who later became a member of the band Chicago. Their musical style combines elements of psychedelic rock, soul and R&B, distinguishing them from their San Francisco contemporaries. They are known for their complex song structures and intricate horn arrangements, which are particularly evident in their influential works like "Loosen Up Naturally" and "Follow Your Heart". Despite multiple disbandments and reformations, the Sons of Champlin remain a significant part of the West Coast music scene.