system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Despite having 150+ songs on a playlist (iTunes, Spotify, etc.), when I listen on shuffle it seems like the same set of ~20 songs play. Why does this happen?
gpt
You're not crazy.
I can't find a source atm, but i recall reading that when Apple was first developing the iPod a common complaint about the shuffle feature was that it wasn't "random" enough. In fact, the original version *was* random, or as pseudorandom as possible.

They reworked the shuffle function to weigh highly played / recently added tracks more than seldom played / old tracks, so the songs you love most or just discovered got played first. This rework tested much better with focus groups, and is the version released.

i wish i had the article though...