| 摘要 |
This invention is a musical teaching device for selecting notes of chords, scales and/or sequences of chord tonalities for chord progressions in all keys for any musical instrument, comprising a base or means of support (2, 8, 19, 29) printed on one or both sides with multiple rows of notes in ascending sequence (3, 10, 21-23, 30-37) and one or more members (14, 24, 39) that are movable relative to the means of support and that have groups of windows (15, 27, 41-43), wherein each group selects the notes of chords or scales or chord tonalities for chord progressions. |
