14th c. guidonian hand and musical notations
"The Guidonian Hand was a Medieval mnemonic device to help singers - mostly monks and nuns - in their learning and memorization of hymns and masses. Each knuckle-joint and finger-point on a hand represented a different note in the Medieval and Renaissance tone system [...]. By pointing at any of these joints and points, you could quickly and easily impart music without needing to use costly and labor intensive sheet music." [source]
the pages above stem from a manuscript containing a treatise on music theory by theoger von metz as well as scores of liturgical chants. produced in salem (?), southern germany, c. 1300-1350
source: Karlsruhe, BLB, Cod. St. Peter perg. 29 a, fol. 1r, 6v, and 27r













