I have encountered the claim that b6 chords are often a misinterpretation of a Maj7th chord with the third in the bass... It seems fairly reasonable but my head wants to revert to the b6 (or b13 maybe) in the following modulation from B minor to C minor:
Bm (add9) | GmΔ7 | DΔ (11)/G | F#m(b6, add9) | Em(b6, add9) | Am(b6, add9) EΔ7/G# GMaj7/B | Cm
Do these b6's in fact make sense? Maybe b13 would make more sense (but I used flat 6 since the fifth is placed in a higher octave) or would you vote for replacing them with:
DΔ#11/F# | CΔ#11/E | FΔ#11/A If so, what are your arguments?
I have a fair grasp with theory as in WHAT chords, chords are on their own, but sometimes I get lost as to what their "functions" would be and thus become a bit confused with what to call them.