You listen to your stereo at home and to your computer at work, but filling your commute with tunes requires a portable player. If you commute by car, look for a hard-drive-based model; size doesn't matter much in this situation, so you may as well maximize your value. Connecting your MP3 player to your car audio system can be done with an FM transmitter, cassette adapter, Bluetooth transmitter (if your stereo is Bluetooth compatible), or by purchasing an aftermarket car stereo with an iPod dock or line-input connection. If you commute via subway or bus, look for a compact flash-based player and, to seal out as much of the din as possible, a pair of noise-canceling or sound-isolating headphones.
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