ChuckLanguage

Context: MusicalStuff, ProgrammingStuff

A pretty damned good MusicProgrammingLanguage (C-like, OO, multi-threaded VirtualMachine)

Build your synth up from basic oscillators, filters and effects, right up to musical structures.

http://chuck.cs.princeton.edu/uana/

Unfortunately, unlike other LiveCoding languages like SuperCollider, SonicPi, TidalCycles etc. ChucK doesn't seem to have the same ongoing support and development.