On a bit of a soul and rnb odyssey at the moment. Can anyone recommend me artists/tunes/records similarish to these?

Minnie Ripperton- Inside My Love
http://www.youtube.com/watch?v=sVYIGOPAJgQ

Deniece Williams- Free
http://www.youtube.com/watch?v=imTDWIZwEDU

Smokey Robinson- Quiet Storm
http://www.youtube.com/watch?v=4v1GfHWFk1Y

24 Carat Black- I'll Never Let You Go
http://www.youtube.com/watch?v=N04yk2UqN_k

That kind of smoked out smooth vibe.