<Tr> <Th_colspan="2"> Music video </Th> </Tr> <Tr> <Td_colspan="2"> "Don't Worry, Be Happy" on YouTube </Td> </Tr> <P> "Don'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 . </P> <P> The Indian mystic and sage Meher Baba (1894--1969) often used the expression "Don't worry, be happy" when cabling his followers in the West . </P>

Who wrote and sang don't worry be happy