In 1989, he composed and performed the music for the Pixar short film "Knick Knack". The rough cut to which McFerrin recorded his vocals had the words "blah blah blah" in place of the end credits (meant to indicate that he should improvise). McFerrin spontaneously decided to sing "blah blah blah" as lyrics, and the final version of the short film includes these lyrics during the end credits. Also in 1989, he formed a ten-person "Voicestra" which he featured on both his 1990 album "Medicine Music" and in the score to the 1989 Oscar-winning documentary "".