In reply to:
I think Krall's appeal has something to do with chromosomes.
Well, there IS that, too.

. I don't think of her as having a great voice or a particularly great range. In fact, she has a couple of vocal traits that trained vocalists frown upon (I'll not reveal them because the last time I did, I angered a guy who complained that being aware of them drove him nuts.)
But, I DO think she is an excellent song stylist, a very competent jazz pianist, has a great group of musicians backing her, and, as mentioned before, has a superb mixer (Al Schmitt). When I listen to her SACDs, I SWEAR I could just reach out and touch her (I'm leaving a LOT of messy fingerprints on my TV screen

). The whole package adds up to "very tasty."