The Perfect Lullaby MPkey is a downloadable music collection with four hours of beautiful classical music to soothe children. Produced by Naxos of America in partnership with eMusic, a leading online music download service, the Perfect Lullaby MPkey guides consumers to a special page on the eMusic site with step-by-step instructions and provides a pass code to automatically download tracks as universally-compatible MP3s. Listeners can enjoy the music by playing it on their computer, transferring it to a portable device — such as an iPod — or burning it to a CD. The Perfect Lullaby also includes a full-color booklet with words to famous lullabies.