Arcana
Ataraxia
Bach
Beethoven
Bill Evans
Blizzard Entertainment (diablo soundtrack's ->exellent:)
Canned Heat
Carl Orff (Carmina Burana)
Danny Elfman
Darkthrone (\m/ for productivity-mode)
Darkwell
Dead can dance
Deep Purple
Die Verbannten Kinder Evas (kinda hard to find)
The Doors
Edvard Grieg (mickey mouse, anyone)
Ella Fitzgerald
Eloy (!!!!)
Estampie (midevalish stuff)
Excalibur Soundtrack
Finntroll (for hyper active mode)
Gustav Holst
Janis Joplin
Jean Baptiste Lully
Jimi Hendrix
John Mayall
John Williams (soundtracks by him)
King Diamond (HEADS ON THE WALL!!!)
Lacrimosa (good atmosphere for inspiration to me)
Led Zeppelin
Liquid Tension Experiment (from the Dream Theatre guys)
Louis Armstrong
Mozart
Negura Bunget (kinda weird stuff from Russia)
Qntal (electronic music with opera-like female vocals, kinda interesting, very nice, and very good to code on)
Stevie Ray Vaughn
Taake (about the only good norwegian black metal band still left besides darkthrone)
Ten years after
The velvet underground (Yep, Lou Reed, me too,... )
Uriah Heep (Gypsy!)
Vangelis
Wanda Landowska (Extreme harpsichord stuff, i love this stuff)
Weltenbrand
Zbigniew Preisner