You know, I was thinking last night of posting this very question. Strange...
Anyway, it varies depending on what type of shooting I'm doing.
IDPA or USPSA - Mostly progressive rock, metal, and neotech. Dream Theater, Fates Warning, Lacuna Coil, Illusion of Safety, Unlight, Scanner, Fluke, Vanessa Mae, Boy Hits Car, lots of others.
Bullseye or DCM Rifle - Classical and ambient. Mozart, Bach, Andres Segovia, Penguin Cafe Orchestra, John Dowland, Brian Eno (not Brian Enos.)
Cleaning guns, reading gun-related literature, or surfing TFL - Mix and match the above. I've got Boy Hits Car on the MP3 player right now.
- Chris