Hey today only comes around once a millenium so lets give the devil his due. The most recent thing I have read on this subject, (which is contained in the wikipedia entry connected to the title of this post), says that 666 is actually a numerlogical reference to the Roman Emperor Nero who prosecuted the minority Christian community so vociferously during his reign. Therefore, hell was itself an analogy for the Roman Empire. Not exactly METAL but interesting.
All historical research aside the devil and by extension horror has made for some great tunes. Today we will celebrate The National Day of Slayer and throw in a few other choice cuts to keep things interesting.
First off the classic:
Slayer - Reign in Blood
Then from a slightly different perspective of the devil is Dies Irae. They see the devil as a contrarian rebel in heaven. Lucifer as the light bringer. The style is all over the place but very satisfying. Blues/Rock/Progressive/Krautrock etc...
Dies Irae - Lucifer
Finally, one of my all time favorite bands, The Misfits, who don't really belong here but I have been looking for an excuse to post one of their songs, so here is.
The Misfits - Night of the Living Dead