magnus, 
In this early 1970s documentary on MIT's electronic music studio Barry Vercroe demonstrates a GUI for what is probably a version of the MUSIC language: https://www.youtube.com/watch?v=Ge6SxOmX5Xw This is the earliest instance of a visual programming language for music that I have come across so far #computerMusic, #computerMusicHistory, #blockDiagrams, #MaxMSP, #pureData
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