Credit:
Surf on over the Bandcamp's site, where you will be greeted by a page featuring an enticing array of album covers from SXSW bands (who also use Bandcamp). You can either click on album art to hear specific jams, or just press the "Listen" button to stream a full 1 day, 6 hours, 25 minutes and 41 seconds of music.
I don't know about you, but I like to be prepared when I go to a music fest -- you know, so I don't just go see that band I've seen four times already for a solid fifth round, and stand around perplexed by the plethora of shiny new bands glinting around me.