is a song written by Freddie Mercury and originally recorded by the band Queen for their 1975 album A Night at the Opera. The song is in the style of a stream-of-consciousness nightmare, and has a very unusual musical structure for a piece of popular music (it has no chorus, instead consisting of various seemingly disjunct sections including operatic segments and an a cappella and heavy metal part). Despite this, it was released as a single and became a huge commercial success. In addition, the song is widely hailed as Queen's magnum opus, and it marked a decisive point in the band's career and setting them on the way to become one of the world's most popular music groups. The single was accompanied by what is generally cited as a groundbreaking music video (then termed a "promotional video") which helped establish the visual language of the modern music video. A truncated version of the song was included in all of Queen's subsequent live concert performances (it is quite impossible to reproduce live in its entirety, being a complex studio creation) and still enjoys great popularity around the world. It is ranked #163 on the Rolling Stone magazine's list of "the 500 Greatest Songs of All Time".