He worked as a musician for the Duke of Urbino. Surely there is not a today's surname and da Pesaro means from Pesaro (city or province). In Besard's Novus partus a Ricercar del Signor Stefano da Pesaro gia Musico del Serenissimo Duca di Urbino is included. Likewise Eitner ; different opinion: Zuth (Stefano Pisari, Stefano Pesori and Stefano Pesaro might be the same person).
