I'm afraid that the eponymous Moog synthesizer was inspired by the equally eponymous Theremin, a Russian invention. The (also eponymous) Sousaphone was a differently-shaped tuba[?]. Not being American or Black, I'll hold my peace about the banjo.

And it's OK for banjo players to tell banjo jokes; the better you are, the more you can tell 'em: we know it's not jealousy!

Steve