Moon River is pretty big with me, and jazz is a breeze compared to other genres. But I'd love to do Undisclosed Desires or Starlight by Muse, or I'm Lucky by Joan Armatrading...
I think Reaper by Sia would win out, actually.
I sing a lot. Want to pursue it professionally without an itty-bitty doubt, but like... ack. I need a voice coach so I can get over the voice cracks. And not the Grace VanderWaal voice cracks, or something kinky from a raspy-voiced 90's guy, but like 'oooOooo-kwek-ooooOooo-cough'. As a busker, though, I'd be brilliant. In the big league, as I am now, I would not be so great.