Oh to be in Austin tomorrow. Oh, any day will do, really, but especially tomorrow. It's the start of South by Southwest. The big film and music festival. But you don't have to be in Austin to hear a lot of the new music. This year, the folks at South by Southwest are providing a huge file to download. 750 songs. That's 2.6 gigabites. Download it! Nic Harcourt is music director at KCRW, host of the public radio program Sounds Eclectic -and he's on his way to the big festival.