Chevrolet Cobalt Owners Manual. Using an MP3
Format
Radios that have the capability of playing MP3's can
play.mp3 or .wma files that were recorded onto a CD-R
or CD-RW disc. Radios that have a USB port can
play.mp3 and .wma files that are stored on a USB
storage device as well as AAC files that are stored on
an iPod®.
Compressed Audio
...