Cataclysm is the worst expansion yet, and that was true of the music as well. They took away all of our classic tunes and added in a bunch of junk in its place when they 'remade the world'. They not only didn't make any good music themselves, they actually took out all the good music that was already there.
As a result, the only way to listen to the good old Warcraft music of your memories is to download the soundtrack; Cataclysm stole away all the tunes from the live game.
But I suppose Cataclysm is a positive thing overall, since you can download the old soundtrack, and this way you get good new music as well. 49 minutes of new good music, most of it by Neal Acree. This is lower than any other expansion so far by a good deal. One of the biggest problems is that some songs were pretty good -- if they had been five minutes long. But instead they were 20 minutes long for some god awful reason, and anything repeated that often that long will grow dull.
A lot of other songs were remixes of the old, better tunes, so it's like, why not just listen to the original?
Between these two problems Cataclysm had little left to offer. Though I guess from another point of view, it's only two minutes less than Bjork's hall of fame contribution. So maybe Cataclysm should be patting itself on the back?
Next up is Mists of Pandaria. I loved the exotic Oriental style music they used for this expansion, so I expect Mists to represent itself well in my hall of fame. It can make up for Cataclysm's failures and then some.
Just Pandas and Warlords 'till I'm done.