You could get one of those bluetooth things that plugs in to your cigarette lighter and broadcasts music on a free FM channel. We have a couple and they work pretty well.
They are only useful in areas without FM stations. I had one and threw it away, because every 5 km there would be a station on the same frequency interfering so the copilot had to change the frequency... useless. What a "luck" that Switzerland is shutting down FM. Ah, and you can't do phone calls with it either.
