Yo-Yo Ma is an American cellist. Born and partially raised in Paris to Chinese parents and educated in New York City, he was a child prodigy, performing from the age of four and a half. He graduated from the Juilliard School and Harvard University, attended Columbia University, and has performed as a soloist with orchestras around the world. He has recorded more than 92 albums and received 19 Grammy Awards.

Robert Keith McFerrin Jr. is an American jazz singer, songwriter, and conductor. He is known for his vocal techniques, such as 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. He is widely known for performing and recording regularly as an unaccompanied solo vocal artist. He has frequently collaborated with other artists from both the jazz and classical scenes.