Queen I

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 reportedly the most expensive album ever recorded at the time of its release. The album's title is taken from the Marx Brothers film of the same name.

Sheer Heart Attack is the third album by British rock group Queen, released November 1974. It was produced by Queen and Roy Thomas Baker and distributed by EMI in the United Kingdom, and Elektra in the United States.
The album launched the band to mainstream popularity both in the UK and internationally: the first single, "Killer Queen" reached #2 in the British charts and provided Queen with their first US Top 20 hit, peaking at #12 on the Billboard singles chart. Sheer Heart Attack was also the first Queen album to hit the US Top 20, peaking at #12 in 1975. Digressing from the progressive themes featured on their first two albums, Sheer Heart Attack featured more conventional rock tracks and marked a step towards the classic Queen sound. In recent years, it has been listed by multiple publications as one of the band's best works.