This classical crossover star sways listeners with his smooth voice, but he's more than a tenor with a wide range. Groban's vocal dexterity is matched by his instrumental skills, as he can play both piano and percussion parts. Starting with his self-titled 2001 debut, he has demonstrated an ability to fuse adult contemporary pop styles with the textures of opera, making new compositions sound modern yet stately. He's charmed audiences by collaborating with jazz pianist Herbie Hancock and Broadway star Audra McDonald, bridging musical universes with his accessible, buttoned-up pop.