There are at least five artists under this name. Two black metal Bands, a thrash metal band, a hardcore punk Band and an electronica musician with this Nickname: #1) Mayhem is a black metal band from Oslo, Norway which was originally formed in 1983, taking strong influence especially from Hellhammer/Celtic Frost, Venom and from earlier Bathory. The name "Mayhem" was taken from the title of the Venom song "Mayhem with Mercy".
Mock & Toof are two London based producers who record for Tiny Sticks (UK), Mule Musiq (Japan) & Dfa Records's Death From Abroad (US) imprint*. They were initially noticed with their remix for The Juan MacLean, which was quickly followed up by their re-edit of Madonna's Lycra Virgin. Following more remixes for the likes of Hot Chip, The Scissor Sisters & Maps, Mock & Toof strengthened their position with widely acclaimed singles for Tiny Sticks (Black Jub), Mule Musiq (Zomby) & Rvng Intl (Digits).
There's more than one artist under this name:
1. Thorns (formed as Stigma Diabolicum, but changed name to Thorns after two years) is a Norwegian black metal band, masterminded by Blackthorn (Snorre W. Ruch - also in <a href="http://www.last.fm/music/Mayhem" class="bbcode_artist">Mayhem</a> and <a href="http://www.last.fm/music/Satyricon" class="bbcode_artist">Satyricon</a>). They made two highly influential demos in the early 90's, Grymyrk and Trøndertun, but have only released one full-length album, since the band was founded, in 1989.
Vrag.
[1] Australian Black Metal Band
[2] Norwegian Black Metal Artist, also member of the Norwegian Black Metal Band Vragvold.