Queen are a British rock band formed in London in 1971, and 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 glam rock, heavy metal and progressive rock orientated, however with time the band incorporated diverse and innovative styles in their music, exploring the likes of vaudeville, electronic music and funk. The band digressed from using progressive themes in their music in the mid-1970s, with more conventional and radio-friendly works bringing them greater success. Throughout the 1970s, Queen disclosed the absence of synthesisers on their albums, yet their style continued to evolve. They eventually started using synthesisers in the 1980s, reflecting their experimental approach to music. "Bohemian Rhapsody" it was written by Freddie Mercury for the band's 1975 album A Night at the Opera. "Bohemian Rhapsody" is in the style of a stream-of-consciousness nightmare that has an unusual song structure, more akin to a classical rhapsody than popular music. The song has no chorus, instead consisting of three main parts including a ballad segment, an operatic passage, and a heavy rock solo. Because of its ambiguous style and arrangement, the song is rarely classified by the band or critics under a particular genre of music, however when done so it is usually described as a rock opera piece. Queen Rock Montreal is a live album by English band Queen. It was released in 2007 as a double CD / triple vinyl on 28 October in Australia, 29 October in Europe, and 30 October in the US. It was recorded in Montreal, Quebec, Canada at the Montreal Forum on 24 November and 25 November 1981, ten years to the date before lead singer Freddie Mercury died of complications related to AIDS. This marks the first official release of the film soundtrack to the concert film We Will Rock You on an audio-only format.