Best Buy is entering the increasingly crowded online music locker market with the introduction of Best Buy Music Cloud. The service is the latest to allow users to upload their music to the cloud and stream it to any device, and will challenge similar offerings from Amazon, Apple, and Google. Best Buy’s Music Cloud is made possible by Play Anywhere and features applications for Mac, PC, Android, iPhone, and BlackBerry. A $4 per month premium subscription is available as well as a free package with slightly more limited capabilities.