Director Kenny Ortega addresses the biggest myth about Zac Efron not singing in High School Musical, as he explains Troy Bolton's unique vocals.

High School Musical director Kenny Ortega confirmed Zac Efron did sing in the first installment, revealing why they also used Drew Seeley’s vocals in the 2006 Disney Channel original movie.

While many people think Drew Seeley completely dubbed Zac Efron's vocals, the "High School Musical" director says their voices were mixed.

As Kenny explained, Zac's vocals in the films were mixed with actor Drew Seeley's, who previously recorded the songs before Zac had signed on for the role of Troy. "So he sang everything and we dubbed parts of it,