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666 may refer to multiple artists:
1. 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.
2. A heavy/speed metal band from Caseros, Buenos Aires, Argentina, which released a demo in 1986.
3. A thrash/black metal band from Czechia.
4. A black metal band from Hungary.
5. A groove/thrash metal/hard rock band from Japan. Read more on Last.fm
