It is very quick to load tunes onto USB memory sticks, and they are getting pretty cheap. You can get a plug for the cigarette lighter socket that accepts a memory stick, and works like an iPod, playing through the radio with a tiny transmitter. Much more compact than CDs, and you can rewrite them any time.
I drive a number of vehicles, none of which belong to me, so I find this very convenient. I just carry the gadget in my pocket, along with a memory stick. And in my car, I have torn out the 10-CD changer, which was always a source of trouble, and now use the gadget.
A typical one is
http://www.cyberguys.com...tail.asp?productID=23978
1975 32' Flybridge Sedan, twin Perkins 6-354 diesels, 1:1.53 velvetdrives, 16 X 19 props. Merritt Island, Florida