I've got a sequence of chords, denoted using solmization here:
S: re di do ti A: ti TA la sol B: fa mi ri re
I'd like to write down these chords in B flat major. I'm concerned with the second tone of the alto (the all-caps "TA"). In B flat major, it's either A flat or G sharp.
My question is: which one of the two enharmonic equivalents (A flat or G sharp) is more "correct", more idiomatic to write in this specific case? I. e., should I write
S: C | B | B flat | A A: A | >>> A flat <<< | G | F B: E flat | D | C sharp | C
S: C | B | B flat | A A: A | >>> G sharp <<< | G | F B: E flat | D | C sharp | C
I know that the choice of enharmonic depends on the context of the notes; here's what I was able to come up with so far:
This sequence of chords is descending, so maybe the A flat would be more appropriate;
However, 'di' (B) naturally resolves to 're' (C), and as such, it might be regarded as the leading-tone of C. Hence, the note in question is enclosed between the major sixth formed by D and B, and since the chord is the fourth-sixth translation of the tritone G sharp–B-D, we could write G sharp as well.
So, I can't quite decide between the two. What gives?