There's memorization, and then there's memorization.

It's certainly true memorizing some things leaves them vulnerable to distortion over time. You probably don't remember the flash cards from some school test you took even a few months ago.

But who here seriously would ever "forget" their ABCs? Are you 100% sure the next letter after "G" is "H" and not "K?" Or "T?" Yea. You are. In fact, you probably use the song/rhythm as a standard test.

If you intend to memorize something important, that's the level it has to be memorized at — not flash cards.

FYI, various societies worldwide use poetry/song/music to record immense sums of data. Case in point — https://www.abc.net.au/radionational/programs/allinthemind/indigenous-memory-code/7553976

The downside is, if you're like most Americans raised on television and social media, your brain probably sucks, lol.