Today Activision has released a surprise playable demo of Guitar Hero: Van Halen, the newest installment of the popular music series this time dedicated to Eddie Van Halen, David Lee Roth and company. The demo will occupy about 1 GB on your hard disk queue and is also from the web, as always exclusively by subscribers Gold for the first week. The game is scheduled for December 22 in the U.S., while Europe will arrive in 2010.