There's a new kind of music packing nightclubs with young fans. It's jazz - but not the sound of your grandparents' supper club. Infused with hip hop and other popular musical forms, jazz is being remade. We talk with some of today's biggest and most innovative jazz stars, including Esperanza Spalding and Vijay Iyer, and explore the magic of improvisation. Ecstatic Rhythm; Leroi Jones' "Blues People"; Esperanza Spalding's "Good Lava"; Tord Gustavsen Recommends a Norwegian Jazz Classic; What Is Music?.