Within weeks of Fireball's release, the band were already performing songs planned for the next album. One song (which later became "Highway Star") was performed at the first gig of the Fireball tour, having been written on the bus to a show in Portsmouth, in answer to a journalist's question: "How do you go about writing songs?" Three months later, in December 1971, the band travelled to Switzerland to record Machine Head. The album was due to be recorded at a casino in Montreux, using the Rolling Stones Mobile Studio, but a fire during a Frank Zappa and the Mothers of Invention gig, caused by a man firing a flare gun into the ceiling, burned down the casino. The album was later recorded at the nearby empty Grand Hotel. This incident famously inspired the song "Smoke on the Water"..