A Night at the Opera is the fourth studio album by Queen, released in November 1975. Co-produced by Roy Thomas Baker and Queen, it was the most expensive album ever recorded at the time of it's release. The album takes it's name from the Marx Brothers film A Night at the Opera, which the band watched one night at the studio complex when recording. The album was originally released by EMI in the United Kingdom, where it topped the UK Albums Chart for four non-consecutive weeks, and Elektra Records in the United States, where it peaked at #4 on the Billboard 200 and became the band's first platinum selling album in the US. The worldwide sales for the album are currently over 12 million copies.