プログレッシブ・ロック
In a retrospective review for AllMusic, Stephen Thomas Erlewine called the album "a self-consciously ridiculous and overblown hard rock masterpiece" and "prog rock with a sense of humour as well as dynamics". Erlewine felt that Queen "never bettered their approach anywhere else". Progressive rock historian Stephen Lambe has disputed that the album itself is progressive rock in his book "Citizens of Hope and Glory: The Story of Progressive Rock". He wrote: "While far from progressive rock, it was the band's most grandiose and ambitious album yet, full of great songwriting and prog influences." He said the album was "a neat symbol of the furthest reach of the progressive rock movement".