Dark Tranquillity

Dark Tranquillity is one of the first bands (along with In Flames and At the Gates) to create the Gothenburg Death Metal sound, one of the major factors in Melodic Death Metal.

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 Melodic Death Metal vein, their use of keyboards, clean vocals, solos, breakdowns, and occasional female guest-singers (most notably Nell Sigland of The Crest and Theatre of Tragedy) all varies wildly.

The Gallery in particular, has been highly influential, and bands including Killswitch Engage consider it an inspiration.

Dark Tranquillity is also notable for only having three lineup changes in its history, and four of its original members - Mikael Stane (Lead Vocals), Niklas Sundin (Lead Guitar), Martin Henrikssen (Bassist, later Guitar), and Anders Jivarp (Drums) are still with the band.

Current Line-Up:

Mikael Stane (Vocals)
Niklas Sundin (Lead Guitar)
Martin Henrikssen (Rhythm Guitar)
Daniel Antonsson (Bass Guitar)
Anders Jivarp (Drums)
Martin Brandstrom (Electronics, Piano)

Former Line-Up:

Anders Friden (Vocals on Skydancer, their first album, left the band to lead In Flames)
Frederik Johansson (Guitar)
Mikael Niklasson (Bass)

Discography:

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)

Dark Tranquillity provides examples of the following tropes:

Deranged Animation: The video for "Iridium", a Mind Screw of assorted apocalyptic imagery to match the lyrics.
Genre Shift: 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).
Indecipherable Lyrics: Averted. Stanne is known both for his distinctive growling and his enunciation while doing so.
Mind Screw / Nightmare Fuel: The music video for "Monochromatic Stains," a The Cabinet of Dr. Caligari-esque flood of random images in which the band never appears once.
Mohs Scale of Rock and Metal Hardness: 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.
Signature Song: "Punish My Heaven" could be one, either for The Gallery, the band, and probably Melodeath itself.
Soprano and Gravel: Subverted. This trope is so popular in Melodic Death Metal, 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 Theatre of Tragedy
- Also in "Insanity's Crescendo", "Undo Control", "The Gallery", "...Of Melancholy Burning", a part of "Lethe", and this troper isn't quite sure if songs "A Bolt Of Blazing Gold" and "Through Ebony Archways" from Skydancer also have female vocals to duet.
Trope Maker: Well, co-Trope Maker for Melodic Death Metal along with At the Gates and In Flames, with albums from Carcass and Sentenced being possible Ur Examples.