| 摘要 |
A teaching aid simplifies the understanding and practicing of the inversions of the major triads of the diatonic scale by utilizing a series of insert cards which slide into a simulated keyboard and read up vertically duplicate sets of the scale tones of the triad beginning with the underlying keyboard tone. In contrast with the usual method of inversion indication, wherein sequential indicia point out inversions on the keyboard itself, or on a horizontal scale, by reading up vertically rather than horizontally the student is able to easily see the inversion arrangement without confusing it with the keys that he is playing.
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