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".

Death metal is an extreme subgenre of heavy metal music. It typically employs heavily distorted and low-tuned guitars, played with techniques such as palm muting and tremolo picking; deep growling vocals; aggressive, powerful drumming, featuring double kick and blast beat techniques; minor keys or atonality; abrupt tempo, key, and time signature changes; and chromatic chord progressions. The lyrical themes of death metal may include slasher film-style violence, political conflict, religion, nature, philosophy, true crime and science fiction.