Deep Purple are an English rock band formed in Hertford in 1968. They are considered to be among the pioneers of heavy metal and modern hard rock, although some band members claimed that their music cannot be categorised as belonging to any one genre. They were once listed by the Guinness Book of World Records as "the loudest pop group", and have sold over 100 million albums worldwide, including 7.5 million certified units in the US. Deep Purple were ranked #22 on VH1's Greatest Artists of Hard Rock programme.
The band has gone through many line-up changes and an eight-year hiatus (1976–84). The 1968–76 line-ups are commonly labelled Mark I, II, III and IV. Their second and most commercially successful line-up featured Ian Gillan (vocals), Roger Glover (bass), Jon Lord (keyboards), Ian Paice (drums), and Ritchie Blackmore (guitar).
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