 CONT: At the end of the song, "There Must Be Somethin Better", when  Kermit and Rolph harmonize on a final pair of long notes, they both  hold the notes, audibly, until the end of the song, but Rolphs  mouth changes to a scat/improv line that he sings and we hear. (In  other words, his voice is heard on two different musical lines at  the same time).