A first content selection stored on a portable media device is associated with a first tag. In addition, a second tag that is associated with a second content selection and that indicates that supplemental content related to the second content selection is stored on a peer device is accessed from a peer device. The first tag is compared to the second tag, and, if a commonality shared by the first content selection and the second content selection is identified, an exchange of the supplemental content from the peer device to the portable media device is initiated.