Procol Harum are a British rock band. Formed in 1967, they contributed to the development of progressive rock, and by extension, symphonic rock. Their best-known recording is their 1967 single "A Whiter Shade of Pale". Although noted for its baroque and classical influence, Procol Harum's music also embraces the blues, R&B and soul. In October 2012, the band was nominated for induction into the Rock and Roll Hall of Fame, but were unsuccessful on this occasion.