earliest
neumes above text
neumes
colored lines
neumes
4-line staff
f, c, or g clef
notes on 5-line staff with clef
mensuration (longas and breves)
time signature (perfect or half circle)
most recent
notes on 5-line staff
modern clefs
modern note values (whole, half, quarter, and so on)
modern time signature
italian words and abbreviations for dynamics and tempo
staccato, slurs, and so on