Abstract

A musical slide rule having a slide rule body in the form of a flattened sleeve having two flat surfaces defining a front and back side at two substantially parallel edges and having two open opposing ends. The front and back sides have spatially arranged (horizontally and vertically) apertures and music data printed thereby for displaying cooperative music data which is printed on a flat slide which is inserted through and between the front and back side of the slide rule body at one of the two opposing ends. The slide is operatively positioned by the user to display a correlation between the music data of the slide (showing through the apertures of the slide rule body) and the music data of the rule body. In cooperative combination, the slide and rule provide a useful apparatus and system to a novice or expert musical alike, for displaying substantially all music data including: (1) chord tones and intervals for all keys; (2) scales with various numbers of tones from three to thirteen; (3) a vast variety of intervals, modulations and resolutions to aid the composer, with the various tones displayed for any key; (4) information for transcribing and transposing a score from one clef to another; (5) a universal transposition portion; as well as, (6) a specific guide to individual instruments defining their key relative to the concert key, and providing the appropriate transposition interval.

Other References

• The Willis Music Co., Keyboard Chord Calculator, 1983
• Song Dex, Song Dex Twin Chord Chart, 1953
• King Music Publishing Corp., Song Dex Twin Chord Chart, 1951 & 195