| 摘要 |
A method and device to aid musicians interested in composition, improvisation, and music theory. Various embodiments provide interactive reference tools that organize musical concepts including chord harmonies, chord progressions, cord substitutions, modes, key transpositions, and alternative scales, illustrating how these aspects of music theory are related. A cylindrical first surface having presented upon it musical information in the form of columns of note values and/or intervals may be positioned inside a cylindrical second surface. A second surface, a cylindrical sleeve, may have presented upon it one or more music reference tools which display music theoretic forms and structures in a key-independent manner. The surfaces may comprise printable surfaces on which the musical information and reference tools may be printed, or a digital display device on which the musical information and reference tools may be displayed. The second surface may be proximate to the first surface such that the second surface may be operable to slide over the first surface. The second surface may include various transparent and opaque areas, such that when the second surface is moved over the first surface, a portion of the musical information on the first surface may be viewable through the transparent areas of the second surface. The music reference tools and the viewable portion of the musical information may be operable to display music theoretic forms for particular keys, wherein the key-specific music theoretic forms vary as a function of the position of the second surface with respect to the first surface.
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