Talk:Chord substitutions
"Ab D F# C" :: Ab minor7#9
Not sure where you're getting this chord name from. This chord is simply Ab7-5 (at least an enharmonic equivalent), or an inverted D7-5.
Ab minor 7 (leaving off #9 because it's redundant for a minor chord) is Ab Cb Eb Gb.
Removing the note A from a D7 chord leaves D (1), F# (3) C (b7). We call the third (3/b3) and seventh (7/b7)
the guide tones of a chord. In a dominant chord these guidetones form a tritone interval. This tritone divides
the octave in half.
Hence, F# - C = tritone but also C - F# = tritone (3 becomes b7 and b7 becomes 3)
If C= 3rd of X and F#=Gb then X= Ab7.
Also, you refer to Ab minor in the bass, and this is only usefull in the context of polychords.
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