Sanga? Is that like the street way to say singer? I don't like it, but that's just me. Anyways, I have a very little idea of what RnB is, so I'm just doing the list based off what you guys have, and adding Alicia Keys since according to wiki she's RnB, and I like more of her songs than the others. Real quick; Alicia Keys, Michael Jackson, Akon, Keri Hilson, and Ne-Yo. I only did five, because I don't think I liked the other work of the few others I've heard.
T-Pain was going to make the list, but I decided against it because as much as I love "I'm On A Boat", it really shouldn't be enough to put him on, where the rest I've heard full songs by them, and T-Pain only did the bridge and backing on that track, if I'm not mistaken.