25. "Superwoman" (2007)
Producer: Alicia Keys, Kerry "Krucial" Brothers
Album: As I Am
Keys writes anthems, and she definitely did with "Superwoman" off her As I Am album. Belting out over soft piano chords is Keys' speciality and this song showcases her voice control and range perfectly. It earned Keys her second consecutive Grammy for Best Female R&B Vocal Performance in 2009. Even she says it was her favorite track off the album.