You know that funny thing Snoopy played in the Peanuts cartoons? Yeah, a jaw harp.
I can play one. Pity is, Snoopy never showed you what they can really do. I'm not bashing Snoopy--that dog had mad jaw-harp skills. But the producers thought it was too much and just might blow little kids minds.
Snoopy still makes and sell the best jaw harps I've found anywhere, though.
The cool thing with one of these is they only make one tone--only one note. The many sounds are the result of manipulating the overtones with your mouth. Hey, that's how we talk, too!
Any of you ever play one or any other overtone instrument?