A few short days ago, Blizzard updated their browser-based music player with the fan favorite track "Power of the Horde" by Tenth Level Tauren Chieftain, now known as Level 70 Elite Tauren Chieftain. If you've never heard of this music player before, don't feel too bad. Most players haven't.
Heck, I hadn't heard of it until recently, which is a bit of a shame. There's a lot of great music available here, ranging from the World of Warcraft to Warcraft II. It doesn't provide all of the Warcraft music, you need to buy the CDs for that, but there's enough there fuel some nostalgia or get you in the adventuring mood. Plus, you can check out some of their old holiday specials, which lie somewhere between 'amusing' and 'hilarious.' Oh yeah, there's a dancing ogre. Those are always good. I... think.