I was reviewing tonal harmony basic guidelines when I came across the article Keyboard-style voice-leading schemata and it had notation like this:
I haven't seen syntax like this before, what's it called, and what does it stand for?
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In this example T(1 D2p 3):
You may also notice numbers above the bass notes. This is basso continuo notation (https://en.wikipedia.org/wiki/Basso_continuo)
T, S and D represent Tonic, Subdominant and Dominant respectively. I = tonic, IV = subdominant, and V = dominant. As in key C, T=I=C. S=IV=F. D=V=G.
The numbers show what the lowest note is - often called its 'inversion'. 1 is root, with the root note (the letter name of the chord) at the bottom. 2 moves everything up, so the third of the chord is at the bottom. 3 moves again, so the 5th is under, and there can be a 3rd inversion, where the 7th of a chord is at the bottom. the order of the other notes isn't reflected in that number.