Abstract: 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.