The Deep Purple song "Smoke on the Water" is about a fire at the Montreux Casino in Switzerland. Frank Zappa was on stage performing the song "King Kong" when a fan shot a flare gun off inside the venue and started a fire. Zappa and the Mothers lost all of their equipment in the blaze.
"We all came out to Montreux on the Lake Geneva shoreline / To make records with a mobile - We didn't have much time / Frank Zappa & the Mothers were at the best place around / But some stupid with a flare gun burned the place to the ground / Smoke on the water, fire in the sky..."
The actual incident was captured on Frank Zappa's album "Beat the Boots" in a track entitled King Kong/fire!