Originally posted by Boroda
If you have a cheap FM radio in your car (so no one will break the window to steal it) - there are MP3/FM transmitters that are plugged into cigarette lighter socket.
They're often called FM Modulators here. The problem you'd have with one in Houston depends on the model you own and the stations it can broadcast on. The hispanic stations broadcast at something like 50 times the power level they're legally allowed to, and can/will wash out a modulator sitting directly next to your radio. Nobody says anything to the hispanic stations because then you'd be racist (no, it doesn't make sense, and it's not supposed to appearently).
What turned into a great use for those modulators is actually drive-in movie theaters. Not sure if you have any on your side of the pond (99.9% of them closed here). Instead of huge speaker wire installations, a pole next to your parking spot, and clipping a speaker to your window, you just tune to whatever station they tell you. Much nicer setup.