Here are 3 topics that I found in this community for this jam related to music. Hope this helps a little bit.
https://itch.io/jam/bad-ideas-game-jam-2026/topic/6051883/drop-in-16-bit-rpg-mus...
https://itch.io/jam/bad-ideas-game-jam-2026/topic/6048731/where-do-you-guys-get-...
https://itch.io/jam/bad-ideas-game-jam-2026/topic/6062374/audio-soundtracks