"Killer Queen" is a song by the British rock band Queen. Freddie Mercury (5 September 1946 – 24 November 1991) (lead vocals, piano), Brian May (born 19 July 1947) (guitar, vocals), Roger Taylor (born 26 July 1949) (drums, vocals), and John Deacon (born 19 August 1951) (bass).

It was written by lead singer Freddie Mercury and recorded for their third album "Sheer Heart Attack" in 1974. Considered Queen's breakthrough hit, it reached number two in the UK Singles Chart and became their first US hit, reaching number twelve on the "Billboard Hot 100".

The song has been described as, "the true beginning of Queen's "radio sound" and said to "recall the cabaret songs of yesteryear, but also shows how Queen was fast becoming a master of power pop". Mercury stated that the song was about a high-class call girl.

Guitarist Brian May says of the song,"Killer Queen was the turning point. It was the song that best summed up our kind of music, and a big hit, and we desperately needed it as a mark of something successful happening for us... I was always very happy with this song".

The song's first verse begins "She keeps her Moët et Chandon in her pretty cabinet," and then goes on to quote a phrase falsely attributed to Marie Antoinette (2 November 1755 – 16 October 1793): "'Let them eat cake,' she says, Just like Marie Antoinette".

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