Chord Of The Week 14/1/17 - a Gb7b9add11/Db polychord from "American Idiot" by Green Day

bigjonbigjon Frets: 680
No idea why this song came into my head this week ;-)
This chord comes at the end of the main riff, and is a composite chord played on two guitars overlaid.

The first, more distorted, guitar is tuned down a semitone and is playing the riff A D G D A (G/D) - the bracketed G/D chord at the end is what emerges from striking the open strings xx000x (notes D G B low-to-high), and because of the down-tuning the chord sounds as Gb/Db.

The second, cleaner, guitar is in standard tuning and is playing the riff Ab Db Gb Db Ab (Em/G) - the bracketed Em/G chord at the end is what emerges from striking the open strings xxx000 (notes G B E low-to-high).

Put these two chords together and you have low-to-high Db Gb G(=Abb) Bb B(=Cb) E(=Fb) - using the bracketed note names to count up inclusively along a Gb major scale where Gb is 1, you get Db = 5th, Gb = root, Abb = b2nd or b9th Bb = 3rd, Cb = 4th or 11th, and Fb = (b)7th. Crunching all these together into one chord, played on one guitar with the downtuned part xx000x re-voiced onto the bottom three strings in standard tuning as 998xxx, I get the monster polychord

Gb7b9add11/Db: 998000

You can hear the chord at 0:11 in this video - 

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