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Re: jazz chords in LilyPond

From: Rune Zedeler
Subject: Re: jazz chords in LilyPond
Date: Thu, 19 Jul 2007 22:45:01 +0200
User-agent: Thunderbird (X11/20070604)

(going back on list)

Ed Ardzinski skrev:
I think that 13th chords have the 11th omitted. So "9 add 13" is technically a correct name. The chord that you get keeping the 11th in is tecnically a "13 add 11". At least that is what I've gathered over the years playign with musicians with a better grasp of music theory than mine.

In different countries you have different traditions for how different chords are interpreted. E.g. in Denmark it is quite common to refer to Dm7/g as G11 - iow to leave out the third from the :11-chord. It is impossible to handle all this special cases and to ensure that the encoder (chordnames interpretation context) and decoder (ChordNames context) handle all the cases in the same way. Therefore I vote for the encoder to omit any special cases altogether and do the simple thing - namely - as manual suggests - to add every second note until the specified step is reached.

In all cases it is bad that the encoder and the decoder behaves differently. The decoder clearly thinks that the 13-chord must contain the 11'th step (because d:11.13 is decoded as D13) - so if we decide (even though I vote against) that the 13-chord does not contain the 11, then the decoder should be changed accordingly.

So I don't think the "9 add 13" dsignation is a "bug", just a convention that many of us would not have chosen ourselves.
Perhaps this is the common name for this chord in Europe? I've wondered about that since using LP.

It /is/ a bug that the encoder and decoder behaves differently.
d:13 should after encoding and decoding come out as D13.


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