Wayport streams music in Austin's airport: The streaming audio service is available to Wayport users at the Austin-Bergstrom airport through a relationship with the Texas Music Group, which features many local artists. The music service is free once you're connected to Wayport's network in the airport. The timing is perfect just before SXSW, which I'll be attending the interactive portion of.
You might also mention that Austin Wireless City offers free Wi-Fi in Austin, and has streaming music available from SXSW. This was a very successful project that was implemented at last year's festival as well.