Interesting introduction to the history of musical annotation and copyright. The journey to that sheet music copyright began with Greek and Roman grammarians; they had developed signs to guide declamation (high voice, low voice and falling voice). Musicians adapted those signs to “[indicate] the contour of a melody.” This provided “a memory aid to singers who knew words and melody by heart.” In the mid-1000s, medieval music scholar and teacher Guido of Arezzo decided there needed to be a…