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|Genres||Gothic black metal (early), Symphonic black metal|
|Labels||Avantgardemusic, Displeased Records|
Early years: 1990-1995
In 1990 the band made the first demo tape "Gothik". There were many line-up changes, eventually settling with Cadaveria's vocals, Ossian at guitar, Vlad at bass and Flegias at drums. The band's early occult metal sound was switched to a mix of Gothic, death, and black metal. The second demo, which contained 4 songs, led to a contract for a 7" EP, which came out in 1993. The first 500 copies were sold out in 2 months. In the meantime, the band filmed "The Triumph Of The Death" containing 2 videos: Born In The Grave  and The Red Death.
At the end of 1993, Silent Bard, a musician with classical background, joined the line-up on keyboard. The band released its first full album, The Call of the Wood, in 1995 under Miscarriage Records. The album contains 5 long songs and has a play time of about 60 minutes. After the CD was released, Opera IX replaced the keyboard player with a new member: Triskent.
Opera participated in A Call To Irons an Iron Maiden tribute album, also for Miscarriage Records. The cover chosen by the band was "The Rime Of The Ancient Mariner". Other bands on the album included Vital Remains and Absu.
Sacro Culto & The Black Opera: 1996-2001
In April 1998 the band's second full-length album Sacro Culto was released by the Belgian label Shiver Records. There are six songs in total, for a duration of 70 minutes. The new keyboardist on the album is Lunaris. The CD was presented in digipak format and a video was made for "Fronds of the Ancient Walnut".
In the Biellayear 2000, Opera IX signed to Avantgarde Music. In January of the following year they recorded their third album, The Black Opera - Simphoniae Misteriorum in Laude Tenebrarum, at the Underground studios in Sweden. Black Opera sold approximately 18,000 copies. In September 2001 Avantgarde released a remastered The Call of the Wood with new cover artwork and two bonus tracks: "Rimes About Dying Stones" and "Born In The Grave".
Maleventum and Anphisbena: 2002-2008
Flegias and Cadaveria left the band to form a new musical project, Cadaveria. Opera IX reformed with Taranis on drums and Madras on vocals. Their fourth album, entitled Maleventum, is a concept album about witchcraft and paganism. It was recorded in January 2002 at The Damage inc studios in Ventimiglia.
Madras and Taranis left the band at the same time it was finishing the new album Anphisbena. As of December 2003, the current Opera IX line up features M The Bard on vocals and Dalamar on drums.
New album: 2009-present
The band has recorded a new album which was planned to be released sometime in the beginning of 2011 by Displeased Records. The drum recording has been completed by Dalamar, the bass recording has been completed by Vlad, the recording of the first guitar has been completed by Ossian. The band also posted two video previews of the new album on YouTube. On the 15th of April, 2011 the band terminated the contract with Displeased Records because the label "would no longer guarantee the conditions in the signed contract". Shortly thereafter, the band signed a contract with Agonia Records. A music video for the song Mandragora has been released.
- Gothik (Demo, 1990)
- Demo '92 (Demo, 1992)
- The Triumph Of The Death (7" EP, 1993)
- The Call of the Wood (CD, 1995)
- Sacro Culto (CD, 1998)
- The Black Opera – Simphoniae Misteriorum in Laude Tenebrarum (CD, 2000)
- Maleventum (CD, 2002)
- Anphisbena (CD, 2004)
- Opera IX - The Early Chapters (CD, 2007)
- Opera IX - Mythology XX Years of Witchcraft (DVD, 2008)
- Strix Maledictae in Aeternum (January, 2012) 
- Back to Sepulcro (CD, 2015)
- Ossian - Guitars (1988–present)
- Abigail Dianaria - Vocals (2014–present)
- Scùrs - Bass (2014–present)
- m:A Fog - Drums (2014–present)
- Alessandro Muscio - Keyboards (2014–present)
- Cadaveria - Vocals, Keyboards (1992-2001)
- Madras - Vocals (2001-2002)
- M The Bard - Vocals, Guitars (2003-2014)
- Vlad - Bass (1991-2014)
- Marcelo Santos (Flegias) - Drums (1992-2001)
- Taranis - Drums (2001-2002)
- Dalamar - Drums (2003-2014)
- Silent Bard - Keyboards (1993-1995)
- Triskent - Keyboards (1995-1997)
- Lunaris - Keyboards (1997-2006)
- "Born In The Grave video". YouTube. Retrieved 23 November 2014.
- "The Red Death video". YouTube. Retrieved 23 November 2014.
- "Fronds of the Ancient Walnut video". YouTube. Retrieved 23 November 2014.
- "darkdoomgrinddeath zine: Opera IX interview (2009)". Retrieved 23 November 2014.
- Official news
- Ofiicial news
- Ofiicial news
- Ofiicial news
- "OPERA IX "STRIX" - studio report PT1 - Dalamar drum recording". YouTube. Retrieved 23 November 2014.
- "OPERA IX "STRIX" - studio report PT2 - Vlad bass guitar recording". YouTube. Retrieved 23 November 2014.
- "AGONIA RECORDS : The Konsortium / Svartsyn / Opera IX / New Releases.". Retrieved 23 November 2014.
- "OperaIX - Mandragora [UNCENSORED] OFFICIAL VIDEOCLIP [HD- 720p]". YouTube. Retrieved 23 November 2014.
- "Opera IX - New Video Online, New Album Details Revealed". Retrieved 23 November 2014.