| 摘要 |
A device for presentation of musical concepts includes a scale plate having a periodical 12-step scale with equally spaced symbols for 12 notes with half-note intervals, wherein symbols of 12 consecutive notes form an octave. The device also includes at least one pointer plate, which includes a start symbol. The pointer plate is configured to revolve with respect to the scale such that the start symbol is settable to align with the symbol of any of the 12 notes of the scale. The pointer plate includes 7 pointers specific to a given class of keys wherein, when the start symbol points to a base note of a key, the pointers specific to the class of keys point to the symbols of the notes of the key beginning at the base note. |
