In a continuation of Yahoo Music's move to send their customers over to Rhapsody, YM's shutting down their DRM servers as of September 30. Unlike when MSN's Music servers shut down and then re-opened, it's very unlikely that Yahoo's will do the same, seeing as there's a process to convert your existing Yahoo Music tunes over to Rhapsody. You'll have to transfer the songs before the deadline, or else all you'll be hearing is the sound of yourself weeping over your lost tunes. [LA Times]
Correct me if I am wrong, but I suspect nearly all of the purchases of DRM music that Yahoo is killing off are based on purchases through MusicMatch. It was not bad enough that Yahoo killed MusicMatch (and planted annoying pop-up messages for customers that kept MM running), but now they are killing the purchases that MM customers made.
As Zlevee rightly pointed out, MusicMatch was a great product, arguably significantly better than iTunes. It is unfortunate that Yahoo had to destroy it.