What's the use case of this language?

[freesuraj]

Is there a academic paper, or why this came to be?

[dcutting]

There's no paper or real reason; I made Song just for fun. I liked the idea of a language that was heavily focussed on pattern matching, so that got me motivated to give it a go.

If you love programming, I highly recommend writing your own programming language. It's an amazing feeling to execute code in your own language!