Bobby McFerrin & Yo-yo Ma - Hush

download "hush little baby " audio here
Robert "Bobby" McFerrin, Jr. (born March 11, 1950) is a ten-time Grammy Award-winning jazz-influenced a cappella vocal performer and conductor. He is best known for his 1988 hit song "Don't Worry, Be Happy".

Vocal technique
McFerrin switches rapidly and fluidly between normal and falsetto registers to create polyphonic effects, effectively performing both the main melody and the accompanying parts of songs. He makes use of vocal percussion created both with his mouth and by tapping on his chest. McFerrin is also capable of throat singing — as used in his song "Drive" from the 2005 DVD Live in Montreal — a practice common in central Asian regions such as Tuva and Tibet in which the singer excites the natural overtones from the fundamental vocal pitch, producing a two-or three-part chord of notes from one voice.

A notable document of McFerrin's approach to singing is his 1984 album The Voice, the first solo vocal jazz album recorded with no accompaniment or overdubbing.

McFerrin's song "Don't Worry, Be Happy" was a #1 U.S. pop hit in 1988 and won Song of the Year and Record of the Year honors. McFerrin has also worked in collaboration with instrumental performers including pianists Chick Corea, Herbie Hancock, and Joe Zawinul, drummer Tony Williams, and cellist Yo-Yo Ma.