Mostly heavy-metal / hard-rock, along with some techno/eletronic music, euro-pop, some gangsta rap, and classical music. Mainly I listen to stuff like Anthrax, Alice Cooper, AC/DC, Alestorm, Armored Saint, Agnostic Front, Borknagar, Bonfire, Bon Jovi, Blind Guardian, Children of Bodom, Cinderella, Crashdiet, Cradle of Filth, Dokken, Dimmu Borgir, Danzig, Death Angel, Damageplan, Down, Dio, Europe, Emporer, Exodus, Firehouse, Finntroll, Foreigner, Gamma Ray, Grave Digger, Great White, Guns N' Roses, Hammerfall, Helloween, Iron Maiden, Immolation, Iced Earth, Incantation, Journey, Judas Priest, Jacob's Dream, Krokus, Korpiklaani, King Kobra, Lacuna Coil, Lita Ford, Manowar, Motley Crue, Motorhead, Metallica, Megadeth, Morbid Angel, Mortician, Nuclear Assault, Nevermore, Opeth, Overkill, Ozzy Osbourne, Poison, Pantera, Queensryche, Quiet Riot, Savatage, Slayer, Slaughter, Steel Panther, Testament, Trixter, Tristania, Tygers of Pan Tang, Uriah Heep, Van Halen, Vader, Vains of Jenna, Winger, Warrant, Warlock, Whitesnake, Y&T, Zebra, etc.
> What is the music of hackers?
I don't think there is any such thing... hackers have pretty broad tastes in music, in my experience. But there does seem to be a common thread of thought, suggesting that fairly repetitive, lyric-free music (techno of some sort, for example) is good for listening to when actually programming.
Math rock, dubstep and other energetic electronic music when I want to pump myself up to get through some boring grunt work. Jazz when I am doing a mix of activity. Ambient and classical when I need to focus on delicate or thorny problems.
If I find myself distracted by even sparse ambient or the world is cutting through I will just listen to noise from simplyNoise to block it out.
But the music of hackers is probably experimental/acousmatic/concrete. Stuff like Ryoji Ikeda, Pierre Henry, Kaffe Matthew, etc. That's really music hacking.
http://somafm.com/ => has some pretty cool mixes when I need to hack.