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		    WHAT IS A CAPPELLA ?
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It is a style of music which involves singing without instruments.

Some artists who have performed a cappella are
the Nylons, Manhattan Transfer, the Persuasions, the Four Freshman

an explanation of "a cappella" and info about a cappella singers/groups :
http://www.a-cappella.com/readingroom/a-cappella.html

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Brief biography of BOBBY McFERRIN  (singer, composer, and conductor)
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He was born on  March 11th,  1950 in  New York City.
Both of his parents were opera singers.
He began studying music at the age of 6.
He played piano, toured and performed with various 
        bands, cabaret acts and dance troupes.
Then he became a singer, released his first album in 1982,
        and toured with his band.
In 1983 he began to perform without accompaniment ( a cappella ).
He produced different sounds and rhythm with his body and voice. 
During the 1980s and 90s he continued composing and recording, and 
        won several Grammy Awards.
His song "Don't Worry, Be Happy" topped charts worldwide.
He is considered on of the most important "a cappella" singers 
  of our time because of his remarkable vocal abilities.

BIOGRAPHY AND DISCOGRAPHY at http://www.singers.com/jazz/mcferrin.html
 
His biography,songs,schedule, etc. at http://www.bobbymcferrin.com/