This day in music history.

December 3, 1970, During a concert by Frank Zappa and the Mothers of Invention at the Montreaux Casino, someone throws a bottle rocket into the ceiling. The place burns to the ground not only is Franks equipment lost but so is Deep Purples, they were recording in the basement studio at the time. The incident is immortalized by Deep Purple in their song "Smoke on the Water," which will become a hit (#4) in 1973.
Smoke On The Water by Deep Purple
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 and 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
They burned down the gambling house It died with an awful sound
Funky Claude was running in and out Pulling kids out the ground
When it all was over We had to find another place
But Swiss time was running out It seemed that we would lose the race
Smoke on the water, fire in the sky
We ended up at the grand hotel It was empty cold and bare
But with the rolling truck stones thing just outside
Making our music there
With a few red lights and a few old beds
We make a place to sweat
No matter what we get out of this I know well never forget
Smoke on the water, fire in the sky