Robert Keith McFerrin Jr. is an American improvisational vocal musician, singer, songwriter, and conductor. His vocal techniques include singing fluidly but with quick and considerable jumps in pitch—for example, sustaining a melody while also rapidly alternating with arpeggios and harmonies—as well as scat singing, polyphonic overtone singing, and improvisational vocal percussion. McFerrin performs and records regularly as an unaccompanied solo vocal artist and has frequently collaborated with other artists from both the jazz and classical scenes.