…the events described in song Smoke On The Water transpired: the Montreaux casino fire.
Frank Zappa and Deep Purple: 50 years on from the Montreux Casino fire
This is probably the most recognized riff in all of rock and roll history. And though greatly reduced, Deep Purple survives to this day, having just released a new album.
Although, they might now be better be described as “Ian and the Purples”.