Question: In what year was the band formed that released the album "Sleep of the Angels"?

Context paragraphs:
The Black Crowes discography: This is a discography of The Black Crowes, an American hard rock/jam band formed in 1984 by Chris and Rich Robinson.  Their first studio album, "Shake Your Money Maker", was released in 1990.  Helped by the singles "Twice As Hard", "Jealous Again", "Hard to Handle", "She Talks to Angels", and "Seeing Things", the album peaked at number four on the "Billboard" 200 and went five times platinum in the United States.  "Hard to Handle" and "She Talks to Angels" both reached number one on the Hot Mainstream Rock Tracks chart.

Sleep No More (The Comsat Angels album): Sleep No More is the Comsat Angels' second album, released 21 August 1981 on Polydor Records.  It is widely regarded as a masterpiece that had a major influence on bands such as U2 (who toured with the band) and later groups such as Editors and Interpol.  The album has been reissued on CD three times, in 1995 by RPM Records, in 2006 by Renascent and in 2015 by Edsel Records, with different track listings (see below).  "Sleep No More" produced no singles, but it had the highest UK chart ranking for any Comsats album, peaking at No. 51.

Never A Hero: Never A Hero are a five-piece nu metal band formed in Sudbury, Suffolk, England in 2009.  They self-released their debut EP, 'Socially Awkward' in September 2010, produced by John Mitchell at Outhouse Studios in Reading.  It contains five songs including 'From Heroes To Angels' which received air time on Kerrang!  and Scuzz TV and also 'Trippin on Speed'.  In November 2012 they released their debut album Bleed Between The Lies through Cinderella Records / Musik and Film which the band signed to in early 2012.  The album features 14 tracks, five of which are re-released versions of older demos featured on the band's Myspace.  The band are currently writing for their second studio album to be released late-2014.

Rotting Christ: Rotting Christ is a Greek extreme metal band formed in 1987.  They are noted for being one of the first black metal bands within this region, as well as a premier act within the European underground metal scene.  They are also responsible for creating the signature Greek black metal sound prevalent in the early 1990s.

Healthy in Paranoid Times: Healthy in Paranoid Times is the sixth studio album by Canadian alternative rock band Our Lady Peace, released on August 30, 2005 by Columbia Records.  The disc was released on a standard CD as well as a DualDisc, with the reverse side containing a documentary on the making of the album.  The album fared well in both Canada and the U.S., but didn't match up to the success of its 2002 predecessor, "Gravity".  The first single was "Where Are You", released in Canada during June 2005 and released in the United States a month later.  The second and third singles were "Angels/Losing/Sleep" and "Will the Future Blame Us", respectively.

Sleep of the Angels: Sleep of the Angels is the fifth full-length album by Greek extreme metal band Rotting Christ.

Sleep Forever: Sleep Forever is the second album by San Diego rock band Crocodiles.  It was released by American label Fat Possum Records the year after the band's debut, "Summer of Hate".  "Sleep Forever" was recorded in a vintage studio in Joshua Tree in California's Mojave Desert by James Ford of Simian Mobile Disco.  The record incorporates various styles and shows krautrock, indie, noise rock, psychedelic, shoegaze, drone rock, and '60s girl-group influences.  Additional musicians on the album include the band's touring keyboard player Robin Eisenberg and producer James Ford, who played drums.  Reviewers have noted the often macabre lyrical content of the songs.  "Sleep Forever" was featured on "NME" and "Rough Trade" 's albums of the year lists.

The Fallen Angels (band): The Fallen Angels were an American psychedelic rock band formed in Washington D.C., in 1966.  Spearheaded by the group's lead vocalist and bassist, Jack Bryant, the band released two albums in their recording career, which was marked by lyrical and instrumental experimentation.  Despite never breaking through on a national scale, the Fallen Angels were popular in the American music underground, and their music has been revived over the years.

List of songs recorded by Guillemots: s of 2013 , the indie rock band Guillemots have recorded more than 80 songs for their four studio albums and other official releases.  The band was formed in November 2004, with their first official material being "I Saw Such Things in My Sleep", an extended play (EP) released in September 2005.  The EP contained four songs, including "Made-Up Lovesong #43", a track that would also feature on their first studio album, "Through the Windowpane".  The release of "I Saw Such Things in My Sleep" was followed three months later by Guillemots' debut single, "Trains to Brazil".  Like "Made-Up Lovesong #43", it was also included on "Through the Windowpane", which was released in July 2006.  The album's songs were well received by critics: review aggregator Metacritic gave the record a score of 81 out of 100, indicating "universal acclaim".  Craig McLean of "The Observer" described them as "gorgeous tunes that are lithe enough to cope with the little bursts of sonic madness".  Two additional tracks were released as singles from the album: "We're Here" and "Annie, Let's Not Wait".

The Angels discography: The Australian hard rock band, the Angels, have released thirteen studio albums, three live albums, six extended plays and forty-seven singles.  The Angels were formed in Adelaide in 1974 by the Brewster brothers, John and Rick, together with Bernard "Doc" Neeson.  The line-up of the band has since gone through numerous changes with Rick as the mainstay member.  They are known as Angel City internationally (to avoid confusion with now defunct 70's glamsters Angel) and later albums were released as The Angels from Angel City.  The Band always hated the international names.  Not all albums are available internationally and the ones that have been released generally have a different track listing and often an altered album cover from the original Australian releases.

Supporting paragraphs: Sleep of the Angels Rotting Christ
Answer: 1987