Robin Humphrey Legge, Dictionary of National Biography… (1895)
“ Meanwhile Osborne's theological studies were pursued with lessening interest, and when twenty years old he finally decided to adopt music as his profession. In this step he was warmly supported by the Prince de Chimay, who procured for him the appointment of instructor to the eldest son of the Prince of Orange, afterwards king of Holland. In Brussels Osborne, as chapel-master to the Prince of Orange, gave many successful concerts, at one of which he met De Bériot. With him he wrote no less than thirty-three duets for violin and pianoforte, many of which enjoyed a great vogue for a time. ”
