Sure, Lyfe Jennings' tenor isn't perfect -- it's rough and somewhat nasal -- but it manages to convey a certain emotional resonance that isn't there in more technically proficient singers; it's effective, but it's also appropriate considering the singer's back story. After being convicted of an arson charge, Jennings spent much of his early adulthood in prison -- in fact, his debut album is named after his inmate number. Jennings spent his time behind bars wisely, learning to play t...  [+]