I just played some piano for the first time in a bajillion years and so much of my muscle memory just flowed back and it reminded me of when I was my sons age and my mum would sit at the piano and play the minuet she learned as a young girl and it blew my mind that she could remember it because that was "sooooo long ago" but like.... it's just in there. Forever. And once your fingers warm up, it's like no time passed... and maybe I should try to learn a new song?