You get a bonus double post tonight. Aren't you lucky? :) (I've had this one mostly typed up for a few weeks now, just hadn't posted it yet.)
I can't write to music with English-language lyrics (Portishead seems to be the exception...they're one of my absolute favorites). So I look for either lyric-less, or foreign language. Lately my tastes have been leaning toward harder music. German metal bands are my favorite of the moment. First I'll list the bands I've been writing to since the start of NaNo, then those I write to in general.
Emilie Autumn - Unlaced (no lyrics, her other stuff all has lyrics. Well, Laced doesn't, but classical hasn't been fitting the mood for this book.)
Danzig - Black Aria and Black Aria II. Fabulously creepy.
Nightwish - Dark Passion Play instrumental disc
Also going to try Brian Eno and see how it fits for this novel. He hasn't come up in the playlist yet though. I also might add the Kingdom of Heaven soundtrack, since parts of my novel center around Jerusalem, and the music is beautiful.
Emilie Autumn - Laced/Unlaced album
explosions in the sky
Godspeed! You Black Emperor
Dead Can Dance (but not the songs where the male is singing.)
Lisa Gerrard - I absolutely love her voice!
Sacred Spirit (Native American)
Dream Catcher (Native American)
Lord of the Rings soundtracks
Kingdom of Heaven soundtrack
Nine Inch Nails - Ghosts I-IV
Conjure One - the songs without lyrics anyway
Pure Moods 1-4 (songs without lyrics)
Danzig - Black Aria and Black Aria II are instrumental albums
20 hours ago