Re: jazz chords in LilyPond

[Rune Zedeler]

(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.

-Rune