Sales of "The Beatles: Rock Band" have blown past expectations, so much so that Viacom CEO Philippe Dauman said one of the most expensive iterations of the video game might not be available to Christmas shoppers.

The "Limited Edition Premium Bundle," which sells for about $250 and comes with a Ringo Starr/Ludwig-branded "Rock Band" drum kit, could sell out by November, Dauman told Wall Street analysts Wednesday at the Goldman Sachs Communacopia XVIII Conference in New York.

"If any of you out here want to buy some, you better hurry up," he said.

Of "The Beatles: Rock Band" in general, Viacom sold 25% of its inventory in the first week it was released, assisted by positive reviews that he called "unbelievable."

"It is a work of art," he said of the game. "We think it's going to have legs. We'll see."

He also said a recent price reduction for the PlayStation 3 has already spurred "Rock Band" sales, and he expects another boost in a couple of weeks when the price of a Wii console is expected to come down.

However, the Beatles game was beaten to No. 1 on the U.K. ELSPA GfK-ChartTrack All Formats Top 10 by Activision's "Guitar Hero 5" for the week ending Sept. 12. "The Beatles: Rock Band" made No. 4.

"Rock Band" is a joint effort from Electronic Arts, Viacom's MTV Games and Harmonix Music Systems.

Additional U.K. reporting by Andre Paine