Freaking love Patrick Stump, and it always made me sad how much hate he got out of nowhere and seemingly for no reason. His voice is audible gold and I love how much soul influence goes into his sound. I can't think of anyone else whose voice sounds even remotely like his own, though Brendon Urie from Panic! at the Disco pulls off soul pretty well in his own respect.

Brendon is who I would name next, probably! Also, Ingrid Michaelson and Feist.