Here's one that I made up to teach my young sons the song of Red-Eyed
"Here I am. Up here! Here I am. Up here! Here I am. Up here!" Etc etc
etc, on ad infinitum.
I've also found that there are definite dialects with mnemonics.
Supposedly Common Yellowthroat says "Wichety wichety wichety"... But the
ones that nest on our place here in Monkton say "Wich-e-TEE-ah,