Disney's upcoming animated film, Moana, stars Dwayne " The Rock" Johnson as the voice of Maui. Today, The Rock, shared a behind the scenes photo of the recording process on Instagram. He wrote, "Cardio and singing rehearsals.. Big day today of performing my song with Broadway king Lin Manuel Miranda today in the studio for our Disney's animated musical Moana." Miranda is the musical mastermind behind the Broadway hit, Hamilton, and he is writing the music for Moana.