eMusic is a digital entertainment retailer focused on serving customers aged 25 and older. The service offers a vast selection of independent music and audio books in a universally compatible file format at great value. They offer more than 3.5 million tracks from over 27,000 independent labels and more than 2,000 titles from top audio book publishers. eMusic is a subscription-based service that allows consumers to own, not rent, their entertainment. eMusic is also the largest service to sell music -- and the first service to sell audio books - exclusively in the popular MP3 format.