@TheGnarrator@will_redman @DeerhunterMusic Bertram Turetzky might be another person of interest as he recorded the lp the new world of sound with Lesbines in 1968.
@TheGnarrator @DeerhunterMusic Sorry, I wasn’t saying it was his work but that he focused on graphic scores at this place and time. He wrote about Herbert Brün, who was kind of known for writing graphic notation in German although his was far more sophisticated. I would bet a coffee that he could identify.