Vocalist and conductor, Bobby McFerrin, is probably best known for his unique vocal techniques ranging from scat singing to the singing of polyphonic overtones and improvisations. I heard him in performance once and was particularly enthralled with his Bach interpretations.
Enjoy this video of his improvisation of the Bach/Gounod, Ave Maria, “Live from the Marketplace in Leipzig” in 2000. The smiles on the faces of the audience participants (in the rain, no less) are priceless!