Tim Rice and Andrew Lloyd-Webber's concept album became a massive global best-seller, topping the US Billboard Top LPs chart in both February and May 1971.
Few players have infused rock music with the potent mixture of classical and blues influences that Lord did.
The legend of 'Smoke On The Water' sometimes overshadows the song's unusual chart history.
After the 'Perfect Strangers' reunion, Deep Purple were back on album duty little more than two years later with 'The House Of Blue Light.'
The Mk I line-up's show at the famed venue was part of their new focus on the American market.
'Stormbringer' was the second Purple album to feature Mk II staples Ritchie Blackmore, Jon Lord and Ian Paice along with David Coverdale and Glenn Hughes.
In November 1984, the Mk II Deep Purple line-up of Blackmore-Gillan-Glover-Lord-Paice reconvened in style for the album 'Perfect Strangers.'
Even as Gillan became a rock god with Deep Purple, he starred in the famous musical's cast album.
Formed in Hertford in 1968 Deep Purple are often called pioneers of heavy metal and while there’s some truth in that, they would prefer to be viewed as a quality rock group.
The masters of British metal rock, they mutated from the blues to genre-defining sonic mayhem with key discs like their self-titled debut, Paranoid, Master Of Reality and the comeback classic 13.
From powerhouse belters to multi-octave vocalists with mind-boggling versatility, the best male rock singers have left their mark on music history.
The album and Blu-ray feature performances from Gillan's orchestral 2016 tour of Eastern Europe with a band including Purple colleague Don Airey.
The much-acclaimed guitarist also worked with Atomic Rooster and The Electric Gypsies among others.
Watch the new split-screen footage of the Mk II line-up in their early pomp.
The eight albums cover the band's 1972-77 period and their Mk II, III and IV line-ups.