Assertion: sketch | /r/HasProperty | two pages long
Facets:
Source sentences:
text: Haydn wrote the sketch, which is about two pages long, when he was 44 at the request, relayed to him by a chain of two mutual acquaintances, of Ignaz de Luca, who was preparing a volume of brief biographies of Austrian luminaries, Das gelehrte Oesterreich ("Learned Austria").