Ordonez was not a full - time professional musician .
Johann Karl Rochus Ordonez ( 19 April 1734 -- 6 September 1786 ) , also known as Carlo d'Ordonez , was one of a number of composers working in Vienna during the second half of the eighteenth century .
one was not a full - time professional musician .
Johann Karl Rochus Ordonez ( 19 April 1734 -- 6 September 1786 ) , also known as Carlo d'Ordonez , was one of a number of composers working in Vienna during the second half of the eighteenth century .