With only four days left in 2006, Walt Disney's "High School Musical" will have the dubious distinction of being the only best-selling album of the year to fall short of the 4 million copy mark.
The first kids' record and TV soundtrack to top the year-end album sales chart is also - with 3.6 million copies sold through Dec. 20, according to Nielsen SoundScan - the lowest-achieving chart topper since 1991.
It's been a pretty steady decline: "HSM" is the third album in the past six years to fail to crack 5 million copies. Last year Mariah Carey's "The Emancipation of Mimi" sold 4.9 million copies and five years ago Linkin Park's "Hybrid Theory" sold 4.8 million.
No best-selling album of the year has topped 8 million since 2000.