What was Procul Harem's greatest hit

A Whiter Shade of Pale
"A Whiter Shade of Pale" is the debut single by the English rock band Procol Harum, released 12 May 1967.

The record reached number one in the UK Singles Chart on 8 June 1967, and stayed there for six weeks.

Without much promotion, it reached No. 5 on the US charts.

One of the counterculture anthems of the 1967 Summer of Love, it is one of fewer than 30 singles to have sold over 10 million copies worldwide.