“Yesterday his highness rose early and, having prayed, went to church and stayed for the whole service, after which he ate and then rested a little, reading. As usual his highness went hunting and killed two kites. This morning his highness attended Mass in the church, as usual after eating there was vihuela music, after which he went to Vespers.” E-Mah (=Archivo Histórico) Colección Salazar y Castro A11, fol. 301. Trans T. Knighton. Quoted in knighton1989. Knighton comments that there is evidence to suggest that música de vihuela might indicate songs with vihuela accompaniment as well as purely instrumental music.
E-Mah = AHN