> Are the letters used in "Roman numeral harmonic analysis" Roman
> numerals or are some other letters also used ?
There are quite a number of different systems out there, but it's common to them all that they use some combination of Roman letters with numbers (often subscript or superscript), musical accidentals (flat / sharp signs); plus / minus / greater-than or smaller-than signs, and other graphical symbols such as strokes, brackets, circumflex accents...
Many systems (including the "Schenkerian" analysis that is fashionable in the Anglo-Saxon world) use capital Roman numerals as their base symbols while other systems (such as the "Riemannian" analysis that is common in Germany) use letter combinations that stand for the harmonic functions: T, D, S, Tp, and so forth, including the "double-dominant" and "double-subdominant" symbols (partial overlay of two "D"s or two "S"s respectively.)
Do you need a few scans?
Lukas
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