Yahoo! Music is shutting down, and its DRM servers with it. All four of you who bought a track there are losing it shortly. This sort of thing is intrinsic to the model. iTunes still has the same problem, but obviously not enough people have been badly burnt. Meanwhile, the DRM-free world will stay stuck with MP3. Yay.
Update: Yahoo has said it will compensate both its customers.
Of course, one could just pony up the extra few cents, and purchase DRM-free stuff from the iTunes music store.
Well, yeah. Or, more generally, not pay good money for fairy gold.