Simple-copy them to a CD-R or CD-RW and play them on any one of Sony's MP3 capable in-dash CD Receivers. The software that comes with the CD-R/CD-RW burner will allow you to drag the MP3 files over to the new disc, just as you would with any computer file.

There are two definite advantages to doing this. For one thing, you can create your own CD mixes with only your favorite music on the disc. No tracks you'd just skip over anyway. But, you can do that without MP3 playback. The real benefit? With MP3's compression scheme on the job, you can fit over 100 tracks on a CD!! Now that's cool. It does present an issue that's never come up before, though. How do you keep track of all that music?

By arranging it in folders, just as you do with the files on your computer. The folder names must be no longer than eight characters long, and must be all capital letters. The MP3 file names can be up to 31 characters long in caps and lower case letters. Up to 255 folders can be arranged on a single disc, and up to 999 MP3 files can be copied. The limiting factor, of course is the size of each file and how it relates to the CD's total capacity. And that is controlled by the bit-rate at which the MP3 file in encoded. The most common rate is 128 kilobits per second (128Kbps), which is a good balance between sound quality and file size. The higher the bit rate, the better the sound quality, but higher bit rates also mean larger file sizes. So, as with many things in life, it's a trade-off. Using 128Kbps, the file size is about 1 megabit per minute of music, so a 3 minute song takes about 3MB to 4MB of disc space. Since a CD holds 650MB of information, you can fit 162 4MB files on one CD! That's like having a 10-disc changer in your dash.