As an aristocrat, Count Losy's musical activities would have been expected to remain on an amateur basis. Nevertheless, he seems to have gained the admiration of a number of professional musicians for his lute-playing and compositions. In 1697 he took part in a musical contest with Leipzig cantor Johann Kuhnau. While working in Prague in 1715, Gottfried Heinrich Stölzel met Count Losy who "played the lute as well as one who makes a profession of it" and also played the violin. There is no evidence he played other instruments, although there is a rather rich source of transcriptions of his lute compositions for other instruments available (baroque guitar, keyboard, angélique, mandora, and violin).