Diana's big influence was Nat King Cole. She can't play like Cole, nor sing as well, but she's a decent jazz piano player. Not the greatest, but not bad.
The late-great bassist Ray Brown may have been the first to get her signed.
Can she sing? She's no Dee Dee Bridgewater, or Shirley Horn, who btw is a lifetime talent, but DK created a niche for her music when music executives wrapped themselves into her and what do you know, her career took off.
DK's best album, isn't an album...it's a DVD - Live In Paris. The LIP cd isn't the same music. Now you know all there is to know about DK. What makes the DVD so good? If you like jazz, and Paris, you're in for a treat. You can order the blu ray version on Amazon.