COTD #10: C-Δ7#5

Why are you reading this blog? If it's to learn academic chord voicings that sound terrible and have no practical use, you're in luck!

C-Δ7#5
X3644X

It's pronounced as "C minor major 7 sharp five". Above is the root position. While I'm at it, I should give you the first, second, and third inversions:

C-Δ7#5
X6959X
X(11)(10)9(12)X
X(14)(13)(13)(13)X or X2111X

When you buy and play through the Wilmott book, it will ask up front that you learn all the seventh chords with C as the root *that you could possibly want to play*. This turns out to be C7(sus4), plus the four standard types of seventh chords: major, minor, dominant, and minor-major, each with both flatted and raised fifth degrees, except this one. He didn't see the need for this voicing, though I imagine it shows up later in some context.

One other factoid about this one before we leave it off forever: it consists of an A♭ power chord, with both the minor and major 3rds forming the other two notes, Swapping the 5th (E♭) for a ♭7th (G♭) makes a much more normal-sounding A♭7#9:

X(11)(10)(11)(12)X

Hey, add a #5 and that's the first chord I shared. I should quit now, having come full-circle.