Chilliwack is a Canadian rock band centered on the singer and guitarist Bill Henderson. They were active from 1970 to 1988; Henderson re-formed the band in 1997. The band started off with a progressive rock sound that incorporated elements of folk, indigenous, jazz and blues, before moving towards a more straight-ahead hard rock/pop rock sound by the mid-1970s. Their six best-selling songs were "My Girl ", "I Believe", "Whatcha Gonna Do", "Fly at Night", "Crazy Talk" and "Lonesome Mary". The band's line-up has changed many times.

William Allen Henderson is a Canadian singer, songwriter, and music producer. Henderson is best known for his work as lead singer and guitarist with the group Chilliwack in the 1970s and 1980s,