Apple Thoughts: Missing a Brick in the Wall on iTunes

All of Pink Floyd's post-"Dark Side of the Moon" albums have vanished from iTunes, due to the group's contract with EMI that covered those works, which ended on June 30.

You will have to get your fix for those albums from another source, at least in the near future until — or if — a new contract is signed. The albums prior to "Dark Side of the Moon" are still available, since those are under a different contract. But why would you want that old stuff, anyway?