Podbop is a service that brings together upcoming concert events with available MP3s from bands that are performing. All of the information is organized by city, and once you’ve done a city search, Podbop provides a RSS feed that you can subscribe to for each particular city search. What’s cool about the RSS feed is that any available MP3 files from bands that are performing are included within the RSS feed so that you do not have to click through a bunch of links to get at them. The cities that I have looked at seem to include information not only for national touring acts, but also for local bands performing at smaller venues, which is really cool.
Check it out.