system
Given the following post, respond as if you're commenting on Reddit:
human
What is a programming language that has limited use case, but is interesting nonetheless?

So are there any programming languages that interest you, but have a very limited use case?

In my case, it's a grey area, but I think it counts.

Music has always been a hobby of mine, and so is programming now, so the crossover language, Lilypond is what I'm saying. It's a markup language that allows someone to make sheet music with coding rather than a GUI. And frankly, I really like this language, even though I'd never use it for anything practical.

Any similar cases out there?
gpt
Pretty much any of the esoteric languages. They stretch the idea of code by a lot while still staying turing complete (most of them).

Of course they are pointless in productive terms, but very interesting if you're into DSL development.