While he played many roles in Bollywood—actor, lyricist, composer, producer, director, screenwriter—it's as a playback singer that Kishore Kumar found immortality. Whether singing solo or in duets with the likes of the great Lata Mangeshkar, his persona shines through. Amid the opulent heaves of strings and delirious tabla beats, Kumar's voice conveys unbridled, sometimes unhinged joy.