Mercyful Fate is a Danish heavy metal band from Copenhagen, formed in 1981 by vocalist King Diamond and guitarist Hank Shermann. Influenced by progressive rock and hard rock, and with lyrics dealing with LaVeyan Satanism and the occult, Mercyful Fate was part of the first wave of black metal in the early to mid-1980s, along with Venom and Bathory. The band is also cited as a formative influence on many then-up-and-coming subgenres of heavy metal, including thrash metal and death metal, as well as the Norwegian black metal scene.
Since its inception in 1981, Mercyful Fate has released seven studio albums, two extended plays, and four compilations. After several line-up changes and self-made demos, they released their self-titled EP in 1982, with the line-up of King Diamond, Hank Shermann, Michael Denner, Timi Hansen and Kim Ruzz. With this line-up the group recorded their first two studio albums: 1983's Melissa and 1984's Don't Break the Oath.