Dark Tranquillity is a Swedish melodic death metal band from Gothenburg. They are considered one of the pioneering acts of the Gothenburg metal scene, which also includes bands such as In Flames and At the Gates. Dark Tranquillity is regarded as the Gothenburg fathers in the film entitled Out of Nothing: A DT Documentary released by Century Media, which was filmed in their home town in April 2009.

Source: Wikipedia (https://en.wikipedia.org/wiki/Dark_Tranquillity)