| 摘要 |
This invention is a music theory teaching aid which structurally includes a base member, a main wheel member pivotally attached to the base member at a central location, and twelve secondary wheel members each pivotally attached to the base member at circumferentially spaced-apart points, radially outwardly from the main wheel member. The base member bears indicia indicating major scale reference notes for each of the twelve musical keys. Each reference note is associated with one of the secondary wheel members. The main wheel member is pivotable to selectively align indicia thereon to correspond with major reference notes on the base member such that the order of diatonic notes of a selected key are indicated for each mode of the selected key. Indicia on each secondary wheel member radially divides it into twelve equal sections representing chromatic steps of an octave. Also indicated on each secondary wheel member are the diatonic notes of a separate one of the twelve keys, arranged in order at whole- and half-step intervals in associating with the radial divisions. Each secondary wheel member is pivotable to selectively associate the tonic note of each mode of the secondary wheel member's separate key with the association reference note on the base member. Each of the secondary wheel members may indicate major third and minor third intervals between the diatonic notes of the key and may also indicate roots of major, minor, and diminished triads in that key. Such indications may be differentiated by color.
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