Jonathan Coulton + John Roderick

He went for the melodic and (slightly) more serious on recent release Artificial Heart, but Coulton is still a troubadork at heart. For every slyly sad song about relationships, there's a video-game epic ("Still Alive" from the Portal credits) or an old favorite (e.g., zombie drone-along "Re: Your Brains" or a gentle cover of Sir Mix-a-Lot's "Baby Got Back").