I like abusing instruments by playing them in traditions they were never designed for. The Hungarian tilinko is a flute with no fingerholes that plays the harmonic series over the open tube or the (interleaved) series over a stopped tube if you close the end with a finger. Mine is in C so I get a choice of C or G harmonic series. This works well for a lot of blues in G where I and IV predominate. And I get to play washboard with the other hand.