Jazz pianist Herbie Hancock joins us to talk about keeping his hardcore jazz credentials while breaking the pop barrier with “Watermelon Man.” Hancock recalls famous associations with Miles and more, including those on his River: the Joni Letters, a collection of Joni Mitchell tunes. Plus the four faces of New Orleans’ Mount Rushmore — Art, Aaron, Charles and Cyril — the Neville Brothers. Since 1954, when Brother Art hit with the ultimate carnival classic “Mardi Gras Mambo,” the Nevilles have been on the scene, solo or as a group. We’ll hear their legacy of soul, funk and R & B as the brothers tell us how it all came to pass, and how the legacy lives on in the next generation.