Google Music does, as expected, build on the Music Beta launched last May, which allowed users to upload their music to the cloud and stream it from there.

The full service, which launched in the US last night, syncs the user's entire music library across their devices, including playlists.

Google has also launched a music store in Android Market, which integrates with Google Music, offering more than 13 million tracks from Universal, Sony and EMI - there is no word ...