I've been assembling and curating massive playlists of music to listen to on shuffle while replaying certain games I enjoyed. Nothing against any of the games' original soundtrack and sound design, I just want more variety, kinda like how Jet Set Radio and a few others had playlists instead of just set looping themes. I'm also doing self-imposed challenges, so getting a new experience out of something familiar is kinda what I'm going for right now anyway.
Part of where it gets autistic, is that instead of just one big playlist per game, I'm breaking it into multiple playlists sorted by how they fit into different parts of the game. For just Persona 3, I've got four playlists for each season, six for each block of Tartarus, one huge one for the Velvet Room, one for Tartarus minibosses, one for full moon Shadows, one for the three-ish times you fight Strega, one for the final boss, and one for the extra boss. Some playlists have under 100 songs, most have around 200, some have over 200.
I originally intended to just have a couple playlists full of videogame ost remixes for this, but life kept getting in the way of vidya, and listening to music and curating playlists was all I could do while exhausted in every sense of the word. It's been two years since I started doing this, and I'm only just now starting to have time for my backlog again.