Are they constructed of brass tubing bent twice into an oblong shape, and are played by blowing air through closed lips, producing a ``buzzing'' sound which starts a standing wave vibration in the air column inside the trumpet?
Yes
{"article_title": "Trumpet", "article_file": "data/set2/a3", "difficulty_questioner": NaN, "diffculty_answerer": "easy", "quality": false}