"Don't You Worry 'bout a Thing" is a hit single by Stevie Wonder, taken from his 1973 album Innervisions; it reached #16 on the Billboard Pop Singles chart and #2 on the R&B chart.
Incidentally, at the same ceremony, Wonder's next album, Innervisions, won Album of the Year and Talking Books producers Malcolm Cecil and Robert Margouleff won the Best Engineered Album, Non-Classical award for their work on that album.