Fireball - Deep Purple (Live in Denmark, 1972)

Fireball is a song by the English rock band Deep Purple, from the album of the same name.
The song is one of several based on Ian Gillan's real life experiences: "She was a complete mystery to me. This is another tale of unrequited love", he explained.
The song begins with the sound of an air conditioner being switched on, recorded by assistant engineer Mike Thorne. Roger Glover suggested to engineer Martin Birch that the sound of a machine starting up would be a good way to begin both the song and the album, but Birch could not think of anything available that would fit the purpose. Thorne suggested the sound of an air conditioning unit, and duly recorded it, to the band's delight. At the time the members of Deep Purple claimed that the sound was produced by a "special" synthesizer.
Live in Concert 72/73 is a live DVD from Deep Purple, released in 2005. It was recorded in KB Hallen in Copenhagen, Denmark in 1972, but not released until 1987 in Japan, under the title Machine Head Live 1972, and in Europe three years later under the title Scandinavian Nights (Live in Denmark 1972).
It is the only full concert filmed (in black and white) of the Mk II lineup in this era and features a rare live version of "Fireball" (this is one of five Deep Purple concerts released from the tours in 1972, and the only one to feature "Fireball", which was substituted with "Smoke on the Water" one week later). The DVD release also features three tracks from 1973, filmed during a US concert in New York City at Hofstra University in Hempstead, Long Island, in colour. It features the only known official 1970's video recording of "Smoke on the Water", performed by the Mark II lineup, aside from some recovered footage of it being performed in Tokyo on August 17, 1972, which was later released to the public on May 16, 2016.

(from Wikipedia)