[ThoroughlyR]

The FCC keeps information on radio stations, but it doesn't include anything on the station's genre. This could probably be fixed with a classifier that learns based on the station's website.

I've never heard of Shoutcast, I'll have to check it out.

EDIT: SHOUTcast's API doesn't seem to support anything that would allow a show host to gather info on users. That's probably for the best though ..

[lsiebert]

I'm pretty sure that shoutcast stations run their own shoutcast sever, and presumably you get IP addresses, and could then plug them into a IP Geolocation API. If you built an app or plugin for the shoutcast broadcaster, they could know where their listeners were. Now, if you wanted to gather info on other people's servers, that could be problematic, though I suppose, once you built an app for an individual hosting a server, you could have it send the geographical info without IP addresses for analysis purposes and maybe a leaderboard. "You are the 4th most popular dubstep station in Peoria, IL!" Hmm and even anonymous data on that level could potentially have monetization opportunities.

Edit: and you can look at the Yes.com API. http://www.programmableweb.com/api/yes-broadcast-db