I'm not so OCD that I'm going to list all of the albums/tracks I've downloaded from eMusic, but here's a list of artists, in case you want to use it for suggestions.
Aesop Rock
Andrew Bird
Arcade Fire
Bad Brains
Bauhaus
Big Star
Blonde Redhead
Bobby Bare, Jr.
Brightblack Morning Light
British Sea Power
Butthole Surfers
Camera Obscura
Cat Power
Charlie Daniels Band
Chet Baker
Cloud Cult
Daniel Johnston
Deerhoof
Descendents
Devendra Banhart
Einstürzende Neubauten
Flaming Fire
Fugazi
Gore Gore Girls
Gossip
Guided By Voices
Iron And Wine / Calexico
Jay Dee aka J Dilla
Jesus Lizard
King Sunny Ade
Lady Sovereign
M.I.A. (XL)
Madvillain
Matmos
Mekons
Merle Haggard
MF Doom
Nancy Sinatra
Nervous Cabaret
Neutral Milk Hotel
Of Montreal
Oneida
Os Mutantes
Panda Bear
Pink Floyd
Rachid Taha
Richard Hell
Scharpling & Wurster
Sharon Jones & The Dap-Kings
Simone Dinnerstein
Sleater-Kinney
Sonic Youth
Spoon
St. Vincent
Stephen Malkmus
Sufjan Stevens
Sun Ra
Superchunk
Tapes 'n Tapes
Ted Leo / Pharmacists
The Black Angels
The Black Lips
The Books
The Clean
The Cynics
The Fall
The Fiery Furnaces
The Great Plains
The Hold Steady
The Raconteurs
The Sea And Cake
The Staple Singers
The White Stripes
Vampire Weekend
Various Artists
Various Artists - Bloodshot Records
Various Artists - Frochot Music
Various Artists - Gern Blandsten Records
Various Artists - Razor And Tie
Various Artists - Shanachie Records Rock
Yo La Tengo