Madurell 1951; IV: 10: Invoice made out by the organ-builder Miguel Narcis ('magister organorum') to the vicar and obreros  of the Eglesia Parroquial de San Boi de Llobregat for building an organ ('pro organis per me in vestra ecclesia sancti Baudili facere habeo') according to the agreement signed on 11 February 1500 before the notary Miguel Fortuny