| 摘要 |
The invention is an aid for teaching the related major and minor chords and their scale tone structures in each key signature, with emphasis on the more advanced forms of these chords. Structurally, the apparatus comprises a rotatable dial mounted on the front panel of an envelope and having a peripheral display of the scale tone names arranged according to the cycle of fourths, and a plurality of sheets individually insertable in the envelope and each having an arcuate array of indicia denoting the scale tone structures of various major and minor chord types and writing spaces, whereby the student can rotate the dial to juxtapose the scale tones named thereon with the indicia and then inscribe the scale tone names of the particular chords determined from the structured array and the juxtaposed scale tones in the writing spaces.
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