USATODAY.com - Have you taken note lately of all the ways to carry music in your pocket? The iPod lets you schlep boatloads of songs from your own collection. Zunes, Sansas and other gadgets let you listen to an unlimited number of “rented” tracks, provided you remain a paying customer. Portable satellite radios from Sirius and XM serve up numerous channels that cater to very specific musical tastes.

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