A Night at the Opera is the fourth studio album by the British rock band Queen, released on 21 November 1975 by EMI Records in the United Kingdom and by Elektra Records in the United States. Produced by Roy Thomas Baker and Queen, it was the most expensive album ever recorded at the time of its release. The album takes its name from the Marx Brothers film of the same name, which the band watched one night at the studio complex when recording. A Night at the Opera incorporates a wide range of styles, from ballads and songs in a music hall style, to hard rock tracks and progressive rock influences.
The album topped the UK Albums Chart for four non-consecutive weeks, and peaked at No. 4 on the US Billboard 200 chart and became the band's first Platinum selling album in the US. The worldwide sales for the album are over 6 million copies. It also produced the band's most successful single in the UK, "Bohemian Rhapsody", which became their first UK number one and one of the best-selling singles in both the UK and the world.