In high school musical which songs did Drew Seeley sing instead of Zac Efron?

Drew Seeley did not sing any songs in High School Musical. While he did provide the singing voice for Troy Bolton (played by Zac Efron) in the movie, he did not perform in the film itself.

Efron's singing voice was dubbed over with Seeley's for the film's soundtrack. However, Seeley did perform as Troy Bolton in the "High School Musical" television movie and stage production.