Only iTunes Music ⇥
Neven Mrgan:
In iTunes […] go to File and create a New Smart Playlist. Set only one rule: Kind contains Purchased AAC audio file That oughta do it. Now listen to nought but this playlist for a while. How does it feel? Does it feel a bit weird? Are you weirded out right now?
I was writing a similar post this morning, but was saved the trouble by this much-shorter, still-excellent post. The (still hypothetical) iTunes cloud service is a complicated beast.