Here is a short cut from one of my favorite old cartoons. Called 'Dog Gone South'.

https://www.geocities.ws/bkbrat/mp4/YankeeDoodle.mp4

Next I cut from that just the dog playing the banjo. I had to remove the sound from that and slow him way down.
Then I added in BK and his piano.
And here is the only song I could find for them on Youtube that was done with a banjo and piano.

https://www.geocities.ws/bkbrat/mp4/BlueberryHill.mp4