Tauren Chieftain in Shattrath!

Yes, why is the Tauren Chieftain band in Worlds End Travern and playing their songs? I havn´t seen this being announced anywhere! Just came at 18:00 (ST) and dissapperaed at 18:05. Luckily, I Frapsed that event =P But tell me, why did they do this? Did I miss anything?

But hell, it was damn cool!