Dark Tranquillity is one of the first (along with Music/InFlames and Music/AtTheGates) to create the Gothenburg Death Metal sound, one of the major factors in MelodicDeathMetal.

Founded by then-Rhythm Guitarist (later singer) Mikael Stane and lead guitarist Niklas Sundin in 1989, Dark Tranquillity is known for an ever-changing style. No two albums sound alike. While most of their albums are definitively in the MelodicDeathMetal vein, their use of keyboards, clean vocals, solos, breakdowns, and occasional female guest-singers (most notably Nell Sigland of Music/TheCrest and Music/TheatreOfTragedy) all varies wildly.

''The Gallery'' in particular, has been highly influential, and bands including Music/KillswitchEngage consider it an inspiration.

Dark Tranquillity is also notable for having three of its original members - Mikael Stanne (Lead Vocals), Niklas Sundin (Lead Guitar) and Anders Jivarp (Drums) still with the band.

Current Line-Up:
* Mikael Stanne (Vocals)
* Niklas Sundin (Lead and Rhythm Guitar)
* Anders Iwers (Bass)
* Anders Jivarp (Drums)
* Martin Brandstrom (Electronics, Piano)

Former Line-Up:
* Anders Friden (Vocals on ''Skydancer'', their first album, left the band to lead InFlames)
* Fredrik Johansson (Guitar)
* Martin Henriksson (Guitar)
* Mikael Niklasson (Bass)
* Daniel Antonsson (Bass on We Are the Void)

* ''Skydancer'' (1993)
* ''The Gallery'' (1995)
* ''The Mind's I'' (1998)
* ''Projector'' (1999)
* ''Haven'' (2000)
* ''Damage Done'' (2002)
* ''Character'' (2005)
* ''Fiction'' (2007)
* ''We Are The Void'' (2010)
* ''Construct'' (2013)
* ''Atoma'' (2016)

'''Dark Tranquillity provides examples of:'''

* DarkIsNotEvil: Their [[HarshVocals death growls]] are relatively light, their instrumentation is as often soaring and epic as sinister, and their lyrics, while dark, are generally not horribly offensive.
* DerangedAnimation: The video for "Iridium", a MindScrew of assorted apocalyptic imagery to match the lyrics.
* {{Gorn}}: "Still Moving Sinews" is an arguable example. It describes the violent murder of a woman and the subsequent decay of her corpse in a poetic but fairly detailed manner, although the narrator doesn't exactly sound proud about the whole thing.
* GenreShift: Either subverted or played straight, depending on how you look at it. ''Projector'' seemed to be this, with acoustic guitar, piano, clean singing, and progressive and lighter songs compared to its predecessors ''The Gallery'' and ''The Mind's I'', but with ''Haven'', the band returned to a heavier death metal approach, yet kept the keyboards (pervasive) and clean singing (infrequent).
* IndecipherableLyrics: [[AvertedTrope Averted]]. Stanne is known both for his distinctive growling and his enunciation while doing so.
* MetalScream: Type 3
* MindScrew: The music video for "Monochromatic Stains," a ''Film/TheCabinetOfDrCaligari''-esque flood of random images in which the band never appears once.
* MohsScaleOfLyricalHardness: Generally ranges from a 7 to a 9.
* MohsScaleOfRockAndMetalHardness: The majority of their songs are at 9, but a handful of their later, more keyboard heavy songs get as low as 8. Much of ''Projector'' could be 7.
* ReligionRantSong: "The Lesser Faith" from ''Fiction'' and "The Treason Wall" from ''Damage Done'' are Type II. ''Construct'' is an album-sized version of this.
* SignatureStyle: Frequent time signature changes, slow to mid-tempo power riffs, low, breathy growling, symphonic elements, a Gothic-inspired sound, and unusual key signatures. Of the three big melodeath bands, they were the most [[NeoclassicalPunkZydecoRockabilly avant-garde]].
* SopranoAndGravel: Subverted. This trope is so popular in MelodicDeathMetal, yet even when Stanne sings clean (which doesn't happen on every album), his timbre is quite baritone.
** Played straight in "The Mundane and the Magic," a duet with Nell Sigland of Music/TheatreOfTragedy.
** Also in "Insanity's Crescendo", "Undo Control", "The Gallery", "...Of Melancholy Burning", a part of "Lethe", and arguably "A Bolt Of Blazing Gold" and "Through Ebony Archways" from ''Skydancer'' which feature faint female vocals.
* SurrealHorror: A few of their album covers have shades of this.
* TropeMaker: Well, co-TropeMaker for MelodicDeathMetal along with Music/AtTheGates and Music/InFlames, with albums from Carcass and Sentenced being possible [[UrExample Ur Examples]].
* TropeCodifier: For the slower, more progressive school of MelodicDeathMetal as exemplified by them, Eternal Tears of Sorrow, Disarmonia Mundi, Insomnium, Music/TheAgonist, Music/{{Deadlock}}, Kokuyasou, Barren Earth, Persefone, DIO - Distraught Overlord, Music/ExistTrace, Music/{{Mayan}}, early Music/{{Cormorant}} and Music/FleshgodApocalypse.