This singer is a Bollywood star thanks to his vocal appearances as a playback artist behind lip-syncing actors. But Mahadevan's impressive style goes beyond films. Trained in the Carnatic and Hindustani traditions of Indian classical music, he produces long lines of wondrously ornamented melodies—as on his 1998 breakout hit “Breathless,” which was engineered to sound as if it were performed in one breath. Studio tricks aside, Mahadevan's elegant handling of individual notes impresses most, and he's just as captivating when covering songs like “Pretty Woman.”