The absolute essence of timeless rock music is contained in the music of Deep Purple‘s Machine Head . We already knew it then thirty years ago when we asked Ian Gillan and Roger Glover to share their recollections of making “Smoke on the Water”, “Highway Star”, “Maybe I’m a Leo”,”Space Truckin’ “, and “Lazy” for the ninth episode of In the Studio in August 1988, but no one outside of Deep Purple’s inner circle knew the unbelievable back story against which this entire project hinged until then. –Redbeard