Most critics and fans agree the haunting song is about a psychedelic or drunken sexual encounter. Let's face it ... there were lots of those back in '67 when Procol Harum formed!
The song's been covered by other artists countless times, and the OG single sold more than 10 million copies. The band broke up in 1977, but reunited in the '90s and continued to perform here and there until 2018.
Brooker's bandmates said, "The single defining constant of the band's 50-year career, Gary's voice and piano playing was legendary and he leaves behind a legacy that will last for generations. He will be sorely missed by everyone who knew him."