Question: In what year was the Queen album containing the song "The Prophet's Song" released?

Context paragraphs:
Thursday / Envy: Thursday / Envy is a split album containing tracks contributed by the screamo acts Thursday and Envy.  It was released exclusively in a package containing the album on both 180 gram 12" vinyl and on CD — individual CDs or vinyl have not been made available.  Three limited screen printed editions have been made available exclusively through web stores as of September 15, 2008.  The album has since seen a limited release in cassette format, all 500 copies of which were sold exclusively through independent record label, Academy Fight Song's web store.

Innuendo (album): Innuendo is the fourteenth studio album by the British rock band Queen, released on 5 February 1991.  Produced by David Richards and the band, it was the band's final studio album to be released in Freddie Mercury's lifetime and also their last to be composed entirely of new material.  It reached the No. 1 spot on the UK album charts and stayed at that position for two weeks, and also peaked at No. 1 in Italy, the Netherlands, Germany, Switzerland, staying at No. 1 for three weeks, four weeks, six weeks, and eight weeks, respectively.  It was the first Queen album to go Gold in the US upon its release since "The Works" in 1984.

The Queen Album: The Queen Album is a solo cover album of the band Queen by Elaine Paige.  It was released in 1988 and peaked at No. 51 in the UK in November 1988.  This is the only album from Paige to be released on Siren Records and distributed by Virgin Records.  The album was re-issued with different artwork on CD in 1990 on Virgin VIP by Virgin Records.

A Night at the Opera (Queen album): 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, including ballads, songs in a music hall style, hard rock tracks and progressive rock influences.

The Game (Queen album): The Game is the eighth studio album by the British rock band Queen.  It was released on 30 June 1980 by EMI Records in the UK and by Elektra Records in the US.  "The Game" features a different sound than its predecessor, "Jazz" (1978).  "The Game" was the first Queen album to use a synthesiser (an Oberheim OB-X).  "Crazy Little Thing Called Love", "Sail Away Sweet Sister", "Coming Soon" and "Save Me" were recorded from June to July 1979.  The remaining songs were recorded between February and May 1980.

The Prophet's Song: "The Prophet's Song" is a song by the British rock band Queen, originally released on their fourth studio album "A Night at the Opera" in 1975.

Killer Queen (Family Guy): "Killer Queen" is the sixteenth episode of the tenth season of the animated comedy series "Family Guy".  It originally aired on Fox in the United States on March 11, 2012.  When Peter and Chris go away to fat camp, they cross paths with a serial killer who targets overweight teens.  Meanwhile, Stewie is traumatized by the cover of the Queen album "News of the World".  The title of the episode is based on the Queen song of the same name which plays during the end credits.

Reinhold Mack: Reinhold Mack (a.k.a. Mack) is a German record producer and sound engineer, mostly known for his collaborations with rock bands Electric Light Orchestra and Queen.  Most of this work took place at Giorgio Moroder's Musicland Studios in Munich, which became famous after Marc Bolan & T.Rex (with producer Tony Visconti) first discovered it for recordings in 1973.  In 1981 the Queen album "The Game" brought Mack and the band a Grammy Award nomination for Producer of the Year (Non-Classical).

Another World (Brian May album): Another World is the second studio album by Queen guitarist Brian May.  Recorded at his home studio after the completion of the last Queen album, "Made in Heaven", the album was released in the UK on 1 June 1998 and on 15 September of that year in the US.  The album itself started as a cover album.  The "Heroes" concept was to record his favourite tracks from his favourite artists, but the idea soon mutated into a full album.  Some of the covers found their place on the album, whilst others were released as B-sides to singles and on the Another World tour promo CD.  Brian May was on the Alas Smith and Jones show advertising the album.

Son Song: "Son Song" is a song, played as the sixth track of the Soulfly album "Primitive".  Roadrunner Records released this song in the form of single in 2001, but the album containing this song was released a year before.  It is the sixth single released by Soulfly and second from "Primitive".

Supporting paragraphs: The Prophet's Song A Night at the Opera (Queen album)
Answer: 1975