So like the Master Steampunk Computer Games thread, I figured it may be high time to put one together for Steam friendly music.
Here's what I have so far. I know for sure I'm missing a few bands, so please feel free to add to the list and I'll try to keep this first post updated with any new additions.
Abney Park (Electronic/World/Pop)
Absinthe Drinkers, The (Post-Punk/Rock)
Agent Ribbons (Pop/Indie/Rock)
Arcade Fire, The (Indie/Rock/Acoustic/Symphonic)
Beat Circus (Acoustic/Circus)
Beats Antique (Electronic/Hip-Hop/Circus/World)
Beirut (Acoustic/Indie)
Bug (Electronic/Experimental/Symphonic)
Cabaret Decadance (Acoustic/Cabaret)
Clockwork Dolls, The (Electronic/Symphonic/Acoustic)
Clockwork Quartet, The (Acoustic/Indie/Musical Theater)
Cretins, The (Punk-Rock)
Crimson Muddle (Electronic/Coldwave)
Danny Elfman (Symphonic/Rock)
Darius Greene (Acoustic/Indie/Tin-Pan Alley)
DeVotchKa (Acoustic/Rock/Indie/Symphonic/Gypsy)
Decemberists (Acoustic/Indie/Rock)
Diablo Swing Orchestra (Metal/Swing)
Dr. Steel (Hip-Hop/Electronic/Industrial)
Dresden Dolls, The (Cabaret/Acoustic)
Emilie Autumn (Electronic/Symphonic/Metal)
Extraordinary Contraptions, The (Rock/Indie)
Ez3kiel (Electronic/Experimental/Symphonic)
Fermata (Acoustic/Rock/Gypsy)
Flood of Rain (Symphonic/Acoustic/Electronic/Experimental)
Ghostfire (Rock/Indie)
Gogol Bordello (Rock/Acoustic/Gypsy)
Harlequin Jones (Acoustic/Cabaret)
Hellblinki Sextet, The (Acoustic/Rock/Cabaret/Gypsy)
Humanwine (Rock/Cabaret/Punk)
Imaginary Airship (Rock/Pop/Experimental)
In the Nursery (Symphonic/Electronic)
James Gang Experience, The (Hip-Hop/Acoustic/Tin-Pan Alley)
Jill Tracy (Cabaret/Acoustic/Symphonic)
Jim Strange with the Proud & the Damned (Rock/Acoustic)
Johnny Hollow (Rock/Electronic/Experimental/Symphonic)
Juke Baritone & The Swamp Dogs (Acoustic/Rock/Indie/Punk)
Kate Bush (Experimental/Acoustic/Electronic/Pop)
Katzenjammer Kabarett (Rock/Pop)
Lee Press-on and the Nails (Swing/Rock)
Legendary Shack Shakers, The (Rock/Punk/Americana)
Life's Decay (Electronic/Experimental/Symphonic)
Life Towards Twilight (Electronic/Acoustic/Experimental)
Magnificent Seven, The (Cabaret/Acoustic/Rock)
Malice Mizer (Rock/Symphonic/Metal/Experimental)
Men That Will Not Be Blamed For Nothing, The (Acoustic/Punk/Experimental)
Mr. Joe Black (Cabaret/Acoustic)
Nouvelle Vague (Acoustic/Rock/Pop/Bossa Nova)
Paul Roland (Rock/Experimental/Electronic/Symphonic)
Peryls, The (Rock/Indie/Acoustic)
Rasputina (Electronic/Acoustic/Rock/Symphonic)
Real Tuesday Weld, The (Pop/Cabaret/Indie/Symphonic)
Revel Hotel (Experimental/Electronic)
Scarring Party, The (Acoustic/Rock)
Sixteen Horsepower (Rock/Americana/Punk/Acoustic)
Squirrel Nut Zippers (Dixie Jazz/Pop/Swing)
Strawfoot (Acoustic/Americana)
Sxip Shirey (Experimental)
Synthonym (Electronic/Symphonic)
Tenth Stage, The (Electronic/Rock/Symphonic)
This Way to the Egress (Cabaret/Acoustic/Indie)
Tiger Lillies (Experimental/Acoustic)
Tleilaxu Music Machine, The (Electronic/Cabaret/Experimental)
Tom Waits (Acoustic/Rock/Experimental)
Tragic Tantrum Cabaret (Cabaret/Acoustic)
Unextraordinary Gentlemen (Electronic/Symphonic/Experimental)
Unwoman (Symphonic/Electronic/Acoustic)
Vagabond Opera (Cabaret/Acoustic)
Vermillion Lies (Indie/Acoustic/Cabaret)
Vernian Process (Rock/Electronic/Symphonic/Acoustic/Experimental)
Viral Millennium (Metal/Symphonic)
Voltaire (Indie/Gypsy/Pop/Acoustic/Symphonic)
Voodoo Organist (Acoustic/Rock)
Walter Sickert and the Army of Broken Toys (Experimental/Indie)
Widow's Bane, The (Acoustic/Indie)
World Inferno Friendship Society (Swing/Rock/Pop/Indie)
Wovenhand (Acoustic/Experimental/Americana)