On May 5, 1973, Deep Purple’s “Smoke On The Water” is released. The song is based on the true story of how someone had fired a flare gun into the ceiling of the Casino in Montreux, Switzerland, during a concert by Frank Zappa And The Mothers Of Invention. The resulting fire destroyed the building where Deep Purple was set to record a live album the next day. The single will reach #5 in the US and #21 in the UK.