Jaheim featuring Jadakiss - Ain't Leaving Without You (remix)
Vocally Jaheim's probably my favourite male R&B artist. This guy's voice is something else; in an era of Sean Kingstons and Akons I have no fucking idea why he's not more highly-rated. Perhaps because although his albums are reasonably strong they're always tainted with some R&B Thug bullshit and he's yet to take a bonafide classic CD.
Personally I think he's the US vocal equivalent of Lemar, and it's a strange coincidence that they're both artists who a lot of people feel haven't lived up to the potential of their voices.