Some of the earliest written notes in western musical history discovered in Pennsylvania
A ninth-century Latin sacramentary leaf contains early western musical notations above "alleluia", indicating pitch inflections that mark the dawn of modern western musical notation.
Medieval Musical Notations Discovered in 9th-Century Manuscript - Medievalists.net
A 9th-century vellum leaf with early musical neumes, possibly among Western Europe's earliest written music, has been identified and is for sale for $80,000.