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 their musical approach changed over the years. Originally formed as a progressive rock band, the band shifted to a heavier sound in 1970. They were listed in the 1975 Guinness Book of World Records as "the globe's loudest band" for a 1972 concert at London's Rainbow Theatre, and have sold over 100 million albums worldwide.
Deep Purple were ranked number 22 on VH1's Greatest Artists of Hard Rock programme and a poll on British radio station Planet Rock ranked them 5th among the "most influential bands ever". The band received the Legend Award at the 2008 World Music Awards. Having been nominated for induction into the Rock and Roll Hall of Fame in 2012 and 2013, Deep Purple were announced as inductees into the Hall of Fame in December 2015. They were officially inducted on 8 April 2016.