Procol Harum are an English progressive rock band, formed in the 1960s. They are best known for their #1 hit single 'A Whiter Shade of Pale', though they have had a devoted cult following throughout their career.Some of the roots of Procol Harum are in a live band led by Gary Brooker and Robin Trower called The Paramounts, popular performers in the early 1960s. They signed to Parlophone in 1963 (see 1963 in music) and released 'Poison Ivy', a moderate British success in 1964 (see 1964 in music).