Does drew seeley sing zac efron's voice on hsm?

Drew Seeley is best known as the singing voice of Troy for the first High School Musical. While most people believed it was Zac Efron singing the songs, it was later revealed that it was Seeley's voice. Seeley has sung on the following albums: DisneyMania 4, The Cheetah Girls 2, Jump In!, High School Musical, DisneyMania 5, and 6, Radio Disney Jams 9, and High School Musical: The Concert. "Get'cha Head in the Game", a song he co-wrote with Ray and Greg Cham for High School Musical, helped propel the soundtrack to 4 million copies sold alone. He also took over for Efron for the HSM concert (Efron was shooting Hairspray at the time).