This French opera singer is a sought-after presence in the elite opera houses of the world. His tenor voice can fill the largest venues—like his 1996 performance at New York's Metropolitan Opera—and the biggest roles: Rodolfo, Don Carlo and Faust. Alagna's lyric sensibility is aided by his bright upper register, allowing him to deal stunning displays of vibrato; check out the finale of his 2006 recording of “La donna è mobile” from Verdi's Rigoletto. His work holds a romantic sway, whether he's singing classical crossover material or pieces from the canon.