if you need to boost your music collection quickly, try some podcasts.
etown - acoustic, folk, world music - recent shows include Ben Harper and James Taylor
stonesthrow - jazzish, downtempo trip hop, hiphop, funk, soul
ropeadope - quality music of all types
smithsonian - folk and world - includes leonard cohen, woody guthrie
There's gotta be something you like from NPR's Live in Concert series...Paul Simon, Modest Mouse, Cat Power? Polyphonic Spree, Bjork, Arcade Fire??
http://www.npr.org/templates/story/s...toryId=4627437
There's a ton of free music out there if you've got your ears open and your eyes to the ground.