On May 26 in 1973, Deep Purple’s “Smoke on the Water” is released. The song is based on the true story of how someone had fired a gun into the ceiling of the casino at Montreux, Switzerland during a concert by Frank Zappa & the Mothers of Invention. However, record collectors prize “Hush” by Deep Purple more than their other hits. “Hush,” released in 1968 on Tetragrammaton Records is worth up to $400.00 with its picture sleeve.