The interesting thing there I found "Byzantine notation, on the other hand, is relational; the note is dependent on the previous note and the symbol itself, which specifies the interval from the previous note. "
EDIT: Saw Ethiopian notation there and got curious and found this chant (performance?) from a music school from Addis Ababa
https://orthodoxwiki.org/Byzantine_Notation
The interesting thing there I found "Byzantine notation, on the other hand, is relational; the note is dependent on the previous note and the symbol itself, which specifies the interval from the previous note. "
EDIT: Saw Ethiopian notation there and got curious and found this chant (performance?) from a music school from Addis Ababa
https://www.youtube.com/watch?v=iztBcn3UZIA