I was inspired by Ukulele Cat to knock up my own version of the Keyboard Cat tune. It’s dead simple, just the D and Dm chord shapes on the C, E and A strings. Make sure you’ve got the chord shape in place at the start of the bar and you’re good to go.
For the picking I’m using:
Thumb – C-string.
Index – E-string.
Middle – A-string.
My version is in a different key. Here’s a version in the original key.