This is the opening track on Machine Head
, an album recorded in Montreux, Switzerland, but not where they intended. Deep Purple wanted to record in a concert venue to get the acoustics of a live performance, so they booked the Montreux Casino. The day after they arrived in Switzerland, Frank Zappa played the casino. Deep Purple was in the audience and saw the place light up - literally. Someone shot a flare into the ceiling that could fire and set the wooden building ablaze. Everyone got out safely , but the casino burned to the ground. They ended up using the Grand Hotel, where they were staying, as a studio, using the Rolling Stones' mobile truck to record (this unit, a 16-track studio on wheels, was what they planned to record with all along, but they ended up parking it outside the hotel instead of the casino).
The band embraced the disorder, improvising to get quality sound by setting up in various rooms and corridors. They ended up achieving their goal of capturing their rugged live sound on tape. The album went down as one of the greatest in the history of hard rock, most notable for "Smoke On The Water
," which tells the story of their adventure in Montreux.