I got a question for you: "Do n't Worry, Be Happy" is a popular worldwide hit song by musician Bobby McFerrin. Released in September 1988, it became the first a cappella song to reach number one on the Billboard Hot 100 chart, a position it held for two weeks. The song's title is taken from a famous quotation by Meher Baba. The "instruments" in the a cappella song are entirely overdubbed voice parts and other sounds made by McFerrin, using no instruments at all; McFerrin also sings with an affected accent. The comedic original music video for the song stars McFerrin, Robin Williams, and Bill Irwin, and is somewhat shorter than the album version.

Answer this question: who sing the song don't worry be happy?
Let's think first:
To answer the above question, the relevant sentence is: "Do n't Worry, Be Happy" is a popular worldwide hit song by musician Bobby McFerrin.
Therefore, the answer is musician Bobby McFerrin.