earliest
neumes above text
neumes
colored lines
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
any school based questions?