Maybe you could do some of my ideas?
It's really been done like a 100 times so it's not original at all. There have been radios done that are much better than this, but I still think you could come back to this and make it better in some ways.
The background is really nice, but perhaps you could help out some artists by taking some random pictures from the art portal and using them as backgrounds. I'm sure as long as you credit them and ask them for permission that they wouldn't mind!
I agree that the cube was kind of nice, but useless. Why not have a bunch of mini-games in it? People could play the mini-games while they have the radio going on in the background. This would be much better than just a cube that really doesn't do anything fun.
I also think that the text on the buttons are way to simple and boring. Perhaps go to one of those websites where you can download a cool font and put it to use in this submission. It really does take a little bit away from the visuals of the submission.
So if you don't want a minigame section of the radio you could perhaps include something that would be very simple. Include something where the person could draw a picture to go along with the song or something like that. Like they could visualize what the song would look like and they could draw it right in the game.
Anyway, I think that there is just so little you can do with AS2 with a submission like this. I think it may be time for you to upgrade to a newer version of flash so you can use some AS3. I bet you could create some amazing things with it and you would have so many opportunities to improve this submission itself.
I don't know if it's possible, but is there a way that they can narrow their searches down? For example, they could search for songs, loops, heavy-metal, ambient, hip-hop, classical, etc... This way they can narrow down what they are looking for and they'll enjoy their experience much more.
Anyways, I'll make sure that some more people get to view this. I'll advertise it on the front page in two weeks when I can make another front page newspost and I'll show a few friends. Keep on programming and I'll keep on checking your stuff out.