Insomnium is a Finnish melodic death metal band formed in Joensuu in 1997. The sound and lyrical themes of their music portray darkness, sorrow, loss, pain, and nature. Their music includes elements of progressive metal, black metal, folk metal, doom metal, and metalcore.

Melodic death metal is a subgenre of death metal that employs highly melodic guitar riffs, often borrowing from traditional heavy metal. The genre features the heaviness of death metal but with highly melodic or harmonized guitar riffs and solos, and often features high-pitched shrieked vocals alongside the low-pitched growls commonly featured in traditional death metal. Pioneered by the English heavy metal band Carcass with their 1993 album Heartwork, melodic death metal developed further in Sweden in the mid-1990s. The Swedish death metal scene did much to popularise the style, soon centering in the "Gothenburg metal" scene. At the Gates' Slaughter of the Soul, Dark Tranquillity's The Gallery, and In Flames' The Jester Race, all released in the mid-1990s, were highly influential albums in melodic death metal, with At the Gates and In Flames being the two most common influences on North American 2000s heavy metal bands. Many American heavy metal bands emulated At the Gates' sound, resulting in the usage of the phrase "At the Gates worship".