This joyous, riveting film, a fascinating story of glorious artistry set against a bleak background, has audiences grinning from ear to ear. With its ancient palaces and stately gardens, the Lahore of Pakistan’s 1947 independence was a haven for the arts, with a musical culture passed down over centuries. Today, Islamization, ethnic divisions, war, and corruption have torn apart Pakistan’s cultural fabric, and this vision of Lahore exists only in stories. In 2004, Sachal Studios was founded to create a space for traditional music in a nation that had rejected its musical roots. It quietly released some classical and folk albums—and then an experimental album of jazz performed on South Asian instruments brought them worldwide notice. Wynton Marsalis invited them to perform with the Jazz at Lincoln Center Orchestra for a remarkable concert. The rehearsal scenes are almost as much fun as the concert itself.