On this note, there's a fantastic (bit of a curiosity item, but fantastic nonetheless) called Tempest for Eliza (http://www.erikyyy.de/tempest/) which will show the appropriate patterns on your screen to produce, as interference in a nearby AM radio, any music you pass to the program - including MP3s in its recent versions.

I used to think it would only work with a CRT, but it actually makes no mention of such a restriction in its latest README, and since I'm at work I'm not able to test it right away.