One sure KNEW how to whistle without Slim's help

Whistle
1

To Have and Have Not–the movie

Last scene, when “Slim” (Loren Bacall) leaves “Cricket” the pianist*

  1. Who’s the musician starting the final theme on a pennywhistle?
    (1944 Jazz and pennywhistle, how come it didn’t strike me before?)

  2. Does one know the name of the tune, and a source for its score?

  3. Finally what sort of pennywhistle is this–all shiny metal with a straight bore? Somehow it looks like these unsigned chrome-plated things Blackbeer and I sampled from eBay.

*Hoagy Carmichael, of Star Dust and Georgia on my Mind fame