What I saw was:"Humdrum was originally created by David Huron in the 1980s, and it has been used steadily for decades."
From: https://www.humdrum.org/ Andrew David Kastrup wrote on 17/04/2021 8:55 PM:
Cannot find info on Humdrum's age on its web site. Basic notename syntax of LilyPond was taken from its MPP precursor.
