Thereminhttps://www.youtube.com/watch?v=LYSGTkNtazohttps://www.youtube.com/watch?v=KDG15-iTJLwhttps://www.youtube.com/watch?v=yfWOWI6-F-A10 musical instrumentshttps://www.youtube.com/watch?v=97f_Fpu_kR0Marble machinehttps://www.youtube.com/

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