Embodiments are directed to a musical instrument having buttons, where the buttons determine the magnitude of the interval by which the melody will jump from the last note played. With a small number of interval buttons and an up/down strum bar, embodiments can play almost any melody and more notes than a piano. One embodiment is directed to an interval-based guitar including fret buttons whose input signals are used to calculate the interval by which to change the pitch of the prior note. Providing input via a strum bar or a sensor, a new note is generated by adding or subtracting the interval to/from the prior note to generate a new note.
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