Disney learned Sunday that its High School Musical brand has limits to its success. Only 4 million viewers tuned in to High School Musical: Get in the Picture , a talent competition that aired on Disney's ABC. The show placed dead last among the key demographic group of adults 18-49. Last year 17.24 million viewers tuned in to the Disney Channel for the debut of High School Musical 2 . ABC was apparently so confident of big numbers for Sunday night's show that it scheduled a repeat for tonight (Monday).