Note : I had trouble to name this question properly. I would've gone with "What's that chord name" but it doesn't seem to help anyone that would stumble across a similar problem to find my question. Anyway, my question seem to be very specific.
Context : I'm pretty new to music theory I'm trying to analyse the music "Rude Buster" from Deltarune OST (link), and so far I'm slowly making progress in understanding the piece, which is nice :) Though, there's a part where I struggle to find the adequate way to analyse it.
The piece is in F#minor. In the first half of bar 1 & 3, the crazy bass highlights an
F#5, which goes well with the chord part that does an
A major, creating a
F#m7. Then, in the second half of the measures, it goes to highlighting a weird
G5 chord when the chord section stay on
A major (except for the last one of the bar which is an inversion of
The result is creating some kind of polychord,
A upon G5, or
bIII upon bII5, in relative, assuming that I got the key right.
My problem : The thing is, I can't really make a link between what I hear and what I can analyze out of it, because I've never encountered such a weird combination of notes. Since I can't really put a name on it, I guessed that it should sound dissonant, but it doesn't really to me.
My guesses :
My first guess was just saying that the bass is crazy anyway and "has the right to" (=can without sounding too dissonant) spend half of a measure playing some crazy notes. But it doesn't match it's behavior for the rest of the piece. For the rest, I've figured it did quite a good job playing the chord tones (while often supplementing the fondamental) and while using some passing tones here and there.
Another guess would be that a B is implicit, making this chord
G7#11(with the 9,
A). This make more sense to why this chord doesn't sound that dissonant to me. So I would be tempted to treat it as a
G7#11omit3, in relative a
bII7#11omit3, borrowed from the parallel phrygian I guess ?
I like the second one, but I'll gladly hear what you have to say on it.
EDIT : Actually my second guess can't be totally accurate, as I did not include the
E of the
A major chord, also the
G. And there's no 7 in that chord either. So it would be a glorious
G13(#11)omit3omit7, in relative a
bII13(#11)omit3omit7 ? Pretty crazy chord right here !