"I didn't know if he could sing, so I went on YouTube to find any examples of The Rock singing and what I found was this supercut of when he was a bad guy wrestler. There was a while where he did a heel-turn and he would take out a guitar and taunt whatever town he was in... And I was like, 'OK, that's his vocal range...'" Actor/composer Lin-Manuel Miranda scoured YouTube for any evidence of DWAYNE 'THE ROCK' JOHNSON's musical skills as he prepared to pen songs for the action man's Polynesian demigod character Maui in Disney's upcoming animated film Moana.