“Unless sounds are remembered by man, they perish, for they cannot be written down.” He was right in his time, but it didn't take long for people to find a new way to write music.
"Duly Noted" was an attempt to trace the uneven history of notating music in manuscripts, first with neumes, then with neumes on a staff, to square or diamond-shaped notes on a staff of four to seven lines. There were other methods used in handbooks that didn't quite make it to prime-time. Some of the manuscripts were smaller than a paperback, others were well over two feet tall.
The best thing I found was the Exultet Roll, which was nothing less than 11th century PowerPoint! Since this was an event that combined the Stellar University of Northshield with a Scribes and Heralds Symposium, I included lots of manuscripts with heraldry. I also recycled "Now I know my ABGs" -- a history of the alphabet.