There's been some discussion of Mother and Earthbound over on the Racket Slack/Discord, and it got me thinking. The Earthbound soundtrack is very distinct, and quite weird and trippy in many places. But it's also a good soundtrack that fits the game very well. What other games have weird and trippy soundtracks that mesh well with the game and are also good soundtracks?
I think Paranoia/Psychosis on the PC Engine/TG-16 has a pretty good trippy and weird soundtrack. The game uses lots of weird imagery and seems like it's probably supposed to be about a mind trip, and the soundtrack supports that very well, being both weird and listenable.
I'll update this post with more as I think of them, but I wanted to get it started so we can discuss as we go.