“Does anyone know what this instrument is called and in what music it is used? It only has this one fingerhole and thus produces only 2 notes.”
Answer: “It’s a cuckoo whistle. ”
The @$$ box is a reality in every hospitals break room. It serves for a lot of giggles. :)
..same for #13, #14, #15 and #16
An air diffuser? Oh thank god, that's really not what my first thought was and I was scared...