1. Chart Beat

    February 02, 2006 12:00 AM EST The rewriting of chart history by "High School Musical" is tackled in this week's column, as is news on John Corbett, Carrie Underwood, Dolly Parton, James Blunt and Natasha Bedingfield. 'FREE' THROW: Zac Efron and Vanessa Anne Hudgens are actors, so it's likely…