[SunkenCiv]

The oldest known musical notation isn't all that old. Probably was passed down orally, or if recorded at all, written on non-durable materials.

• Listen To The World's Oldest-Known Melody (1400 BC) [09/27/2016]
• Syria: Scholar Composes Music from Archaeological Ugaritic Cuneiform Tablet [07/09/2010]

[Doctor Congo]

https://www.wqxr.org/story/how-was-musical-notation-invented-brief-history/
Music notation started in 1025.
exactly 1000 years ago.