Published works of the oboist included concertos and research for the oboe, english horn and flute. His playing was extraordinary to the level that Michael Haydn constructed an british horn quartet for him and Mozart constructed a concerto. In correspondence along with his kid, Leopold Mozart composed high praises regarding Ferlendis. His functionality and technique had been lauded from Salzburg to London. It really is believed that Ferlendis was instrumental in developing the curved pipe attaching the reed to your body from the english horn.