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Re:Extempore – An audiovisual live programming environment by iainctduncan on Tuesday May 04, 2021 @02:10PM (#27040674)
Overtone was/is Clojure over SuperCollider. There are a number of other similar lisp things though. Incudine might be the one you're thinking of?
Re:Extempore – An audiovisual live programming environment by vnorilo on Tuesday May 04, 2021 @02:19PM (#27040838)
Nyquist [1] is a XLisp derivative that shares temporal recursion with Extempore. Not sure it had any connection to Emacs though.

1: https://www.cs.cmu.edu/~music/nyquist/

Re:Extempore – An audiovisual live programming environment by iainctduncan on Tuesday May 04, 2021 @03:05PM (#27041542)
Yeah Nyquist is cool too, just got the book. I believe Common Music preceded both Extempore and Nyquist in that regard, and also uses a TinyScheme descendent, s7 Scheme. I use s7 in Scheme For Max for temporal recursion too.

Demo of temporal recursion in Scheme for Max here: https://youtu.be/pg7B8h4yHkU

And my tutorial on it: https://iainctduncan.github.io/s4m-stk/