This is a comparison of online music storage services (Cloud Music Services), Internet services that allow uploads of personally owned or licensed music to the cloud for listening on multiple devices. There were three large services—Amazon Music, Apple's iTunes Match, and Google Play Music—each incorporating an online music store (see comparison), with purchased songs from the associated music store not counting toward storage limits. Other than additional storage space, the main additional feature provided with an annual fee by Apple (and formerly Amazon.com) is "scan-and-match", which examines music files on a computer and adds a copy of matched tracks to the user's music locker without having to upload the files. Google provides both a large amount of storage space and the scan-and-matc