flat four inch by eight inch piece of plastic with a transparent window in the center and a plastic strip with a color-coded representation of either a piano or a guitar, which slides under the window and indicates to the user the proper notes and scales to play for a specified key

'center':16 'code':25 'color':24 'color-cod':23 'eight':5 'either':28 'flat':1 'four':2 'guitar':33 'inch':3,6 'indic':40 'key':54 'note':46 'piano':30 'piec':7 'plastic':9,19 'play':50 'proper':45 'represent':26 'scale':48 'slide':35 'specifi':53 'strip':20 'transpar':12 'user':43 'window':13,38

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