Queen are a British rock band formed in London in 1971 and are one of the most commercially successful musical acts of all time. The group originally consisted of Freddie Mercury, (lead vocals), Brian May (lead guitar, vocals), John Deacon (bass guitar), and Roger Taylor (drums, vocals). Queen's initial works were chiefly heavy metal orientated, however with time the band incorporated diverse and innovative styles in their music, exploring the likes of vaudeville, progressive rock, and even funk. Throughout the 1970s, Queen disclosed the absence of synthesisers on their albums, yet their style continued to evolve. They eventually moved away from said approach in the 1980s, reflecting their experimental approach to music. The group formed when Farrokh Bulsara met May and Taylor, changing the name of their previous band to 'Queen' and his own to 'Freddie Mercury'. Deacon was then recruited by the trio to complete the group. Queen enjoyed success in the UK during the early 1970s, but it was the release of Sheer Heart Attack (1974) and A Night at the Opera (1975) that gained the band international success. The latter featured "Bohemian Rhapsody", which stayed at number one in the UK charts for nine weeks. In 1991 Mercury died of bronchopneumonia, a complication of AIDS, and Deacon retired in 1997. Since then May and Taylor have infrequently performed together, including a collaboration with Paul Rodgers under the name Queen + Paul Rodgers.