Here are two torrents containing all the MP3 files publicly posted on the SXSW website that will be showcasing this year. More may music may show up, these may be packaged up into an third torrent at some point in the future.
SXSW 2009 Showcasing Artists Part 1, 519 files, 2.44GB
SXSW 2009 Showcasing Artists Part 2, 534 files, 2.60GB
If you don’t want to have all these songs on your hard drive but want to have a listen, use this SXSW radio.