Bill Summers played the haunting hook that opens and closes Herbie Hancock’s 1973 hit version of “Watermelon Man.” He crafted frequently-sampled mid-’70s jams like “God Made Me Funky” with the Headhunters. More recently, Summers made a series of stellar albums with Jason Marsalis and Irvin Mayfield as Los Hombres Calientes. On Monday, June 21, the storied musician performs at Dunbar Park. The concert is presented by the Traditional Music Society of Kansas City and UNESCO’s Creative City of Music initiative. Details about the free event are here.