English rock group Procol Harum was founded in 1967. The 1967 smash single "A Whiter Shade of Pale" is their most well-known song and one of the few singles to have sold over 10 million copies. Procol Harum's music is categorised as psychedelic rock and proto-prog with overtones of the blues, R&B, and soul even though they are renowned for their baroque and classical influence.