 Zac Efron (qv)s singing voice was that of Andrew Seeley (qv),  who was also considered for the role. Seeley sang the entirety of  "Getcha Head in the Game" and the reprise of "What Ive Been  Looking For." Efron only sings the first four lines of "Start of  Something New," the first sentence of "Breaking Free," and during  the scene on the balcony. The reason for this is because Efrons  natural voice was too low for that of a tenor and the producers  wanted a tenor to match the role.