Is Lalah Hathaway Singing More Than One Note At The Same Time?

At first listen, I thought Lalah (yeah, the daughter of Donny Hathaway) was using some processing or a vocal harmony pedal or something, but nope. She really is doing the impossible vocal feat: This is really her voice and she's nailing chords with just her alone, and in perfect harmony too!! If you're not a musician, you can tell just how NUTS this is by the reactions of those she's playing with!