MUSIC-N
Umbrella name for Max Mathews' MUSIC I–V programs at Bell Labs (1957–1968), the common ancestor of nearly every audio programming language.
MUSIC I (1957) could manage exactly one triangle wave. The decisive step came with MUSIC III in 1960: unit generators, small building blocks such as oscillators, filters and envelopes that users patched together into instruments. The same idea as the modular synthesizer, only in code and several years before Moog's first modules.
The programs split the work into an orchestra (how the instruments sound) and a score (which notes play when). MUSIC V was written in Fortran in 1968, which made it portable and carried the concept to universities worldwide. Its descendants include Csound, Cmusic and, more loosely, SuperCollider and Pure Data. Rendering a minute of audio could take hours, so patience was part of the toolkit.