Next version of Ubuntu comes with Built-In Music Store
Looking to further its mission of making your software, and your media, free of restrictions, Ubuntu is bundling an Ubuntu One Music Store into 10.04, the next release of the Linux operating system due out in April. The store uses 7Digital as its provider, likely due to its greater international availability than Amazon’s own offering, and looks to be integrated into the Rhythmbox music player.
Source: Lifehacker