When my siblings and I were young, our mom (in her infinite wisdom) made us all take piano lessons.
None of us lasted a long time on it, except my sister who could play the world’s hardest song, “The Spinning Song” from book #3 or 4 in the Thompson series. I remember it went something like “deedle deedle dum dum, da da, deedle deedle dum dum, da da!
She must have played that pattern ONE BILLION TIMES! (even 20 years later it rattles through my head)