There have been more than 1,000 cover versions of "A Whiter Shade of Pale," the debut single by British progressive-rock band Procol Harum. The hauntingly beautiful song with its Bach-like melody and trippy lyrics was a perfect soundtrack for the Summer of Love. It hit the #1 one spot on the U.K. charts on June 8, 1967, and remained there for six weeks. In fact, it's one of fewer than 30 singles to have sold over 10 million copies worldwide.