The actor plays demi-god Maui in the movie musical, in which he belts out a big solo song, and although he has exercised his vocal cords in the past, he felt a lot of pressure singing for the big screen, reported E! online.
"I've sung in the past, and in Polynesian culture, we sing, we dance, we play ukulele or guitar, things like that - but not to this level," he said.
"It's Disney, and there's music involved. In a way, it's a musical. There's a lot of pressure. But I had the best time - really, the best time.