I guess I'm just missing a basic understanding of how to read the formulas (all the following is in the C major scale). what does the lowercase i stand for in i-bIII-IV-bVI/bVII?... using your method how would you write out CEG-EGC-BbDF-ACF (my translation of I-bIII-bVII-IV)?... Does I5 just mean CG? what does I6 mean? Does I7 translate to CEGBb? and why is that chord resolved by the F chord if It's in the key of C?
I hope thats not too many questions... I really appreciate your help
1)
Upper case Roman numerals for chords with a major third and some form of 5th (Perfect, augmented (#5), diminished(b5)).
Lower case Roman numerals for chords with a minor 3rd and some form of 5th (Perfect, augmented (#5), diminished(b5)).
2)
So, i-bIII-IV-bVI-bVII with C as it tonic note (the 1 note) becomes:
Cminor (CEbG) - Eb (EbGBb) - F (FAC) - Ab (AbCEb) - Bb (BbDF)
3)
How would you write out CEG-EGC-BbDF-ACF (my translation of I-bIII-bVII-IV)
Should be rendered as
I - I/3 - bVII - IV/3
Note that /3 means "with the 3rd of the chord in the bass"
4)
Does I5 just mean CG?
Yep, a power chord
5)
What does I6 mean?
I6 means the same thing as I/3, i.e. the 3rd of the chord is in the bass. In figured bass, the 6 is short for 6/3 meaning that the chord is built with scale tone intervals of a 3rd and a 6th above the given bass note. When we decipher this we come back to a chord in first inversion : EGC
6)
Does I7 translate to CEGBb?
No: It translates to CEGB.
It would need to be Ib7 to be CEGBb!
7)
And why is that chord resolved by the F chord if It's in the key of C?
B - C : Semi-tone movement upwards
G - A : Tone movement upwards
E - F : Semi-tone movement upwards
C - F : 5th downwards
The parallel perfect 5ths moving a semi-tone provide a strong resolution whilst the downward movement from the C to the F clinch the resolution. G moving to A completes the chord.