In iTunes, Apple has latched on to a craze, especially among younger people. The iTunes software can quickly convert your CDs into a library of MP3s or vice versa, and give you access to thousands of radio stations that play the kind of music you want to hear, 24 hours a day. It'll even sync with your iPod to make your music portable. But that's only part of the picture. If you have a computer with a built-in CD burner (or a separate CD burner ), you can make a music CD with your favorite tunes. If you're a music enthusiast, Mac OS X is the operating system for you.