Gottfried Weber

In this work, Weber develops the idea of "Mehrdeutigkeit" (that is, "multiple meaning"), a term initially introduced by Georg Joseph Vogler.

Weber's "multiple meaning" refers to individual tones and harmonies, based on their context in a piece of music.

In the same work, Weber also further develops Vogler's idea of Roman numeral designations applied to chords.

Unlike Vogler, Weber implements upper and lower case symbols to show not only the position of each chord related to the scale degree upon which it is built, but also the quality of each chord, i.e. major, minor, diminished, etc.

Weber's Roman numeral system of analysis is in wide use in universities all over the world today to varying degrees, albeit with some modifications.