Patent ID: 7332665

Claim:
A device for musical study, comprising: a. a fixed member and one or more moving members, b. one of said members, either moving or fixed, being printed with all the musical tones or notes available on an instrument being studied, and c. the other of said members containing a transparent window or aperture, printed with a series of geometric shapes, some transparent and others in different colors, in an array corresponding to the standard musical scale relationship of said tones, as arranged on said instrument, d. the two said members having means to make them capable of varying alignments whereby the user can display information critical to playing said instrument in a selected key, e. said colors being selected to differentiate the relative scale position of said notes or tones, with the first scale position having a first predetermined color, the third scale position having a second predetermined color, the fifth scale position having a third predetermined color, and those notes or tones which are not in the relevant key being partially obscured with a fourth predetermined color.