One of the ways jazz has grown is by absorbing the sounds and rhythms of other cultures. African and Latin American music were strong early influences. Today, India is making waves. Since classical Indian music has always included extensive improvisation, it seems it might have happened sooner. However, while spirituals, rumbas and African drums readily appeal to Western ears, Indian raga is a more difficult fit—its scales more exotic, its rhythms more austerely complex. But now, saxophonist R