Sub bass - purple rock - Psychedelic/Space Rock, a progressive rock music sub-genre

During the 1980s, glam metal became popular with groups such as Mötley Crüe and Poison . Underground scenes produced an array of more aggressive styles: thrash metal broke into the mainstream with bands such as Metallica , Megadeth , Slayer , and Anthrax , while other extreme subgenres of metal such as death metal and black metal remain subcultural phenomena. Since the mid-1990s popular styles have further expanded the definition of the genre. These include groove metal (with bands such as Pantera , Sepultura , and Lamb of God ) and nu metal (with bands such as Korn , Slipknot , and Linkin Park ), the latter of which often incorporates elements of grunge and hip hop .

The band started their second US tour in April 1969 with little support from their almost-bankrupt American label and without an album to promote, because of a delay in the manufacturing of the new LP. During the tour, Deep Purple showed a remarkable progress as performers and a musical direction more oriented towards a heavier and louder sound than before. Doubts about compatibility of vocalist Rod Evans with the hard rock music that other band members wanted to pursue brought about the decision of searching for a substitute, which was found in Ian Gillan of the band Episode Six . Gillan formed a songwriting duo with Episode Six's bassist Roger Glover , who was also invited to join Deep Purple and replaced Nick Simper . The band's new line-up, identified as Mark II, debuted live in London on 10 July 1969.

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