Great recommendations. I'd add Terry Riley, whose music has a similar trance-like feel. His album Persian Surgery Dervishes is my favorite flow state inducer.
As a nix-lang fan, I've been using dhall as a nix-like build system configuration language when I need to work outside of the nix ecosystem. I love its use of static typing, but it's not without its rough edges. Defining recursive types is not simple and writing configs which need to mix rigidly-typed domain knowledge with arbitrary loose json data can be very tricky.
It looks nickel's authors have these use cases in mind. I'm excited to keep an eye on this project.