domesticus
Lupus non curat numerum ovium
In a spanish edition about palimpsests I discovered two publications about byzantine musical palimpsests: Annalisa Doneda, I manoscritti liturgico-musicali bizantini:Tipologie e organizzazione, and Maria Αlexandru, The palaeography of byzantine music:A brief introduction with some preliminary Remarks on musical palimpsests. The whole edition is here.