There's a really nifty tool built into the klangmeister demo, nicely showcased here: http://localhost:3449/klangmeister/performance

It's a little graph utility that takes a musical phrase, and generates a basic (but quite useful) canvas representation of the notes.

unfortunately the implementation isn't terribly modular, so I can't simply export the feature into another project. Does anyone know of a library that does something like this?

I might just dive into Klangmeister and figure out how to extract the parts I need, but the codebase is somewhat difficult to take apart

It's bit hard for me to see your localhost. But isn't Klangmeister mostly about porting Overtone to cljs?