(L-R) Herbie Hancock, Igor Butman, James Genus and Avishai Cohen perform at the International Jazz Day 2015 Global Concert at UNESCO Headquarters in Paris, France on April 30, 2015. Photo credit: Kristy Sparow/Getty Images.

PARIS, FRANCE - APRIL 30: (L-R) UNESCO Goodwill Ambassador, Herbie Hancock, Igor Butman, James Genus and Avishai Cohen perform on stage during the International Jazz Day 2015 Global Concert at UNESCO on April 30, 2015 in Paris, France. (Photo by Kristy Sparow/Getty Images for Thelonious Monk Institute of Jazz)