All About Jazz is celebrating Percy Heath’s birthday today! The American jazz musician and bassist with the Modern Jazz Quartet, Percy Heath, began his musical apprenticeship in 1946, after Air Force service. It was just the right time. Though the double bass had always been used sporadically in jazz, performers capable of advancing both its rhythmic and harmonic role into a distinctive jazz-bass language were arriving on the scene more slowly than trumpeters, saxophonists or pianists….