Abstract: Provided is an apparatus directed to identifying desired combinations of musical notes. The apparatus includes a base imprinted with plural different indicia, each different indicium corresponding to a different musical note. For example, the indicia might include musical symbols (e.g., C or G♯/A♭) and/or might include a different color or combination of colors for each note. A template having plural windows may be disposed over the base so as to selectively view plural of the different indicia. It is a feature of the invention that the template corresponds to a particular characteristic, such as the major scales or the minor ninth chords, and different positions of the template relative to the base reveal different sets of musical notes having said characteristic. For example, one position of the template might reveal the C major scale and another might reveal the A♯/B♭ major scale.

Abstract: According to the present invention comprises a plurality of diatonic note playing fret or key, each said diatonic note playing fret or key having a diatonic note playing surface and playing a corresponding diatonic note. Also included is a plurality of diatonic sheets, each said sheet comprising a note color associated with a particular diatonic note, wherein each said diatonic note playing surface has at least one diatonic sheet secured to it such that the note color comprising the sheet corresponds to the diatonic note played by the diatonic note playing fret or key.