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Are you Bart Hopkin, author of the books below?
Musical Instrument Design by Bart Hopkin Gravikords, Whirlies & Pyrophones by Bart Hopkin Wind Chimes by Bart Hopkin Orbitones, Spoonharps & Bellowphones by Bart Hopkin Making Musical Instruments with Kids by Bart Hopkin Making Simple Musical Instruments by Bart Hopkin Getting a Bigger Sound by Bart Hopkin Funny Noises for the Connoisseur by Bart Hopkin Making Marimbas and Other Bar Percussion Instruments by Bart Hopkin Sound Inventions by Bart Hopkin


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