666 may refer to multiple artists:
666 was a German DJ act, formed by Thomas Detert and Mike Griesheimer in 1997. They produced a mix of electronic music and often included lyrics in Spanish and English. The act disbanded in 2005.
A heavy/speed metal band from Caseros, Buenos Aires, Argentina, which released a demo in 1986.
A thrash/black metal band from Czechia.
A black metal band from Hungary.
A groove/thrash metal/hard rock band from Japan.
A crossover thrash band from Japan, also known as…
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