1.0link171639<![CDATA['High School Musical 4' Greenlit]]>http://www.huffingtonpost.com/2009/03/03/high-school-musical-4-gre_n_171639.htmlLOS ANGELES — The Disney Channel is going back to school with "High School Musical 4."
The fourth iteration of the popular musical franchise will begin production later this year and premiere in 2010.