Darn, too bad you missed her!
Jim, yes, I've noticed too the chameleonesque qualities of her voice. Sometimes I hear Minnie Ripperton sweeness and light, sometimes there's a Chaka Khan earthiness, sometimes there's that Stevie Wonder like authority and wisdom. . . . Her cascading and contrapuntal backgrounds are killer as well. Nobody seems to do it better.
As you say, you sum up all this stuff, the poetic nature of her lyrics, the supple strength of her music, the wise choices of the production, the very "vibe" she brings. . . .
Just like 'lectric Miles, I tell ya, even down to shifting sonic sounds of her lead instrument from work to work!
MASSIVE talent. I'm spreading the word.