I was at a vaudeville/jug band type performance, where the band handed out these cheap kazoo's. Instead of humming, I played it like a trumpet with lip buzzing, which actually worked pretty well, kind of like lip buzzing a mouthpiece. I found I could play all kinds of songs on it. I wonder if there are any instruments that are fine tuned for that type of use. As far as I know there are trumpet shaped kazoos and mutes with kazoo type diaphragms. I was thinking maybe a kazoo but designed for lips to go in the cup rather than, around the outside, and a little more sturdy. Maybe it might be fun to practice mouthpiece buzzing with.