2011-10-26 Procol Harum  are a British rock band, formed in 1967, which 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