"Ozzy Osbourne, the only mortal to openly challenge the Lich King?s claim to the title "Prince of Darkness" and survive, will take the stage live at Anaheim Convention Center to rock the closing ceremonies of BlizzCon 2009.
Although tickets to the convention sold out in minutes, you can still join in with the
'BlizzCon Virtual Ticket' live Internet stream or via DIRECTV Pay Per View. The Virtual Ticket will feature 18 hours of BlizzCon coverage, including Ozzy?s live performance, as well as the BlizzCon 2009 exclusive in-game pet: Grunty the Murloc Marine.
Check out the
official press release to learn more."
Arthas Menethil, Crown Prince of Lordaeron and Knight of the Silver Hand, was the son of King Terenas Menethil II and heir to the throne. He was trained as a Paladin by Uther the Lightbringer, and had a romantic relationship with the sorceress Jaina Proudmoore. But despite his promising beginning, Arthas became one of the most powerful and evil beings Azeroth would ever experience when he merged with the Lich King.
He is the main antagonist of the newest WoW x-pac. Wrath of the Lich King.
EDIT:
http://www.wowwiki.com/Arthas Here's my source.
Seriously though, it's a good marketing, I'm just wondering how will Ozzy reach the BlizzCon site? The last time I saw him he wasn't able to move/walk/think, I think the only last thing working with this legend of rock, is his voice. Singing? No problem, you'll feel the energy from the debths of hell in the whole stadium. Walking? Standing? Not enough strength anymore... Please bring me a Frozen Throne or anything so I can sit on while singing.
If by 'WoW music' you mean the songs played by Level 80 Elite Tauren Chieftain, like "I am a murloc", "Rogues do it from behind", etc... They are played by a real band, formed of some members of Blizzard's staff. I'd be REALLY surprised to see Ozzy singing L80ETC songs at all...
http://www.wowwiki.com/L80ETC
(Go take a look at the 'Members' section, you'll have a surprise seeing the band members ^_^)