Movable chord finder

Claim 1

Apparatus to teach rhythm chords to be played on stringed instrumEnts having a plurality of frets and strings on a fingerboard, which strings are strummed to produce sound, comprising a body portion having two spaced slots within said body portion extending longitudinally thereof and a flat simulated fingerboard inserted in each slot and slidable therein; a plurality of window means spacedly arranged on the front surface of said body portion and on the back surface of said body portion, said window means being positioned in pairs in the upper and lower halves of said front and back surfaces, said pair of window means in the upper halves of said front and back surfaces communicating with the upper one of said slots, said pair of window means in said lower halves of said front and back surfaces communicating with the lower one of said slots, each fingerboard having on the front and back surfaces thereof a plurality of longitudinal lines simulating the number of strings on a particular stringed instrument and a plurality of lines transverse to the simulated string lines representing the number of frets on said particular instrument, the simulated string lines being identified by the actual notes of the respective strings on the actual instrument, the fret representation lines being identified by the numbers corresponding to the numbers of the respective frets on said instrument, selected window means on one of said surfaces of said body portion bearing indicia varyingly placed on said window means with reference to said simulated strings and said represented frets to indicate two or more positions of the fingers on the fingerboard of said instrument to produce the same rhythm chord.