Tarja Soile Susanna Turunen-Cabuli (born August 17, 1977), generally known as Tarja Turunen or simply Tarja, is a Finnish singer-songwriter. She is a soprano and has a vocal range of three octaves.

She's best known as the former lead singer of the Finnish {{Symphonic|Metal}} PowerMetal band Music/{{Nightwish}}. In 2005, she left the band after receiving an open letter, leading to a public back-and-forth volley between her and the rest of the band. The letter claimed that she had missed too many rehearsals and that her husband influenced her behavior, though she vehemently denies these claims. Both she and her husband have since talked about their side of the story.

Her first solo album, ''Henkäys Ikuisuudesta'', was released in 2006.

Tarja has the unusual distinction of being a female soprano singer for a metal band. Her voice alone led to Nightwish being labeled as "opera metal". "Female-fronted metal" has become a subgenre in part due to the success of Nightwish. In particular she's known to have inspired future Music/{{Epica}} vocalist Simone Simons to study classical singing after hearing Tarja sing on ''Oceanborn''.

Finnish President Tarja Halonen called her "the voice of Finland". She is well-known across Europe and has a small yet devoted following in North America.

!!With Nightwish
* 1996 - ''Angels Fall First''
* 1998 - ''Oceanborn''
* 2000 - ''Wishmaster''
* 2001 - ''Over The Hills And Far Away'' (EP)
* 2002 - ''Century Child''
* 2004 - ''Once''

* 2006 - ''Henkäys Ikuisuudesta'' ([[NoExportForYou Only available in Finland]])
* 2007 - ''My Winter Storm''
* 2010 - ''What Lies Beneath''
* 2011 - ''Live At Sibelius Hall'' (with Harus) -- this is a classical album, not metal.
* 2013 - ''Colours In The Dark''
* 2016 - ''The Shadow Self''
* 2017 - ''From Spirits and Ghosts (Score for a Dark Christmas)'' - An atmospheric/classical Christmas album with a couple of original songs.

!!Notable Collaborations
* 2013 "Paradise (What about Us?)" as a feature credit with Music/WithinTemptation
!Tarja shows examples of:
* CoverVersion: "[[ComicBook/TheSnowman Walking in the Air]]" in ''Henkäys Ikuisuudesta'', "[[Music/AliceCooper Poison]]", in ''My Winter Storm'' and "[[Music/{{Whitesnake}} Still Of The Night]]", as a bonus of ''What Lies Beneath''. She also sung "[[Music/SodaStereo Signos]]" and "[[Music/SeruGiran Desarma y Sangra]]" in live concerts.
** Tarja performs a lot of covers live, ranging from classical pieces to 80's rock medleys and even some Music/{{Nightwish}} songs as a CallBack to her former band.
* GenreBusting: While generally SymphonicMetal, Tarja's solo material shows aplenty of influences from ClassicalMusic, AlternativeMetal, ArenaRock, [[ProgressiveRock Prog]], Pop, PsychedelicRock, Industrial and even Ambient. ''Colours in the Dark'' is especially [[GenreRoulette prominent]] in its experimental nature.
* GratuitousForeignLanguage:
** "Montañas De Silencio" is sung in Spanish.
** Most of ''Henkäys Ikuisuudesta'' is sung in Finnish. She sings a gorgeous version of "Ave Maria" on this album in German.
** "Mystique Voyage" is in *four* different languages.
** On ''From Spirits and Ghosts'', Tarja sings "O Tannenbaum" in the original German, and one verse of "O Come, O Come Emmanuel" in Latin.
* LighterAndSofter: "Underneath", "I Feel Immortal", and "Calling Grace" from her solo albums. ''Live At Sibelius Hall'' has her singing classical music.
* OneWomanWail: Quite possibly the world grandmistress of this, with classical operatic vocalizations a common feature of her songs.
* SomethingSomethingLeonardBernstein: It was nigh-impossible early in her career to figure out what she was singing. She got better about that.
* {{Supergroup}}: So far, you have [[Music/{{Masterplan}} Mike Terrana]], [[Music/{{Angra}} Kiko Loureiro]], [[Music/{{Apocalyptica}} Max Lilja]] and Music/VanCanto accompanying her.
* TakeThat: Tarja responded to her former band's personal attacks in ''Dark Passion Play'' with [[https://www.youtube.com/watch?v=imBsSIFjPfA "Enough"]], which accuses Tuomas Holopainen of being a prima donna who choked her with darkness and couldn't comprehend that her love for her husband Marcelo Cabuli is genuine. They've reconciled somewhat since then: Tarja has spoken approvingly of her replacement Anette Olzon's performances and is friends with Anette's replacement Floor Jansen (which dates to Floor's time with Music/AfterForever), and has had guest appearances in her solo career by Floor and, in 2017, by Marco Hietala.
* WeUsedTobeFriends: This is pretty much Tarja and the rest of Music/{{Nightwish}}. They all seemed tight-nit with the amount of success the band got with the albums of ''Wishmanster'', ''Century Child'' and ''Once'', but then after her final performance (ironically from a final performance called ''End of an Era''), the band released an open letter announcing her termination from the band. There's been multiple stories of what lead to the band splitting from Tarja (The band, Tuomas and Marco especially, accusing her of being about the money and her new husband influencing her while Tarja and her husband state that wasn't the case and both argued that the band treated her poorly, in particular Tuomas) but the fact remains is that Tarja was no longer a part of Nightwish as a result. These days the two parties however speak glowingly about each others's skills and even Tarja hasn't shown any regret of her years in Nightwish. It seemed the hatchet was buried as of late, considering Tarja has performed with Marco, is known to be friends with Floor and even praised Anette's performances.
* WinterRoyalLady: In the cover art of ''My Winter Storm''.
* WomanInWhite: The cover art for ''From Spirits and Ghosts'' has Tarja's skin painted stark white, save for bright red lips; the music videos for the album (e.g. [[https://www.youtube.com/watch?v=spJlqZIHK24 "O Come, O Come, Emmanuel"]]) have even her hair and clothes white.