The High School Musical series became a successful franchise which included two television films, a feature movie, a spin-off and numerous soundtrack albums. The popularity earned by Tisdale in High School Musical led her to sign a solo record deal with Warner Bros. Records in 2006. Her debut album Headstrong, was released in February 2007, and debuted at number five in the U.S. chart and sold 64,000 copies in the first week. It was later certified Gold by the Recording Industry Association of America. A second studio album, Guilty Pleasure, was released in 2009.
Tisdale owns a production company and has worked as an executive producer in movies which included the ABC Family television film Picture This. Tisdale has a prominent voice role as Candace Flynn in Disney Channel's Phineas & Ferb, a cartoon which became television's most-watched animated series among kids and tweens and had been met with acclaim by critics. In 2009, she was cast in her first major broadcast role in The CW's television series Hellcats as Savannah Monroe, an intense and very religious cheerleader.