Re: 13th chord?

[Thomas Morley]

2017-02-26 0:38 GMT+01:00 David Kastrup <address@hidden>:
> Thomas Morley <address@hidden> writes:
>
>> 2017-02-25 23:08 GMT+01:00 David Kastrup <address@hidden>:
>>> Rob Torop <address@hidden> writes:
>>>
>>>> When I enter a 13th chord like this e:13, it renders with a 9 as well.
>>>> I know a 13 chord officially contains the 9 and 11, and that lilypond
>>>> by convention will omit the 11.  But I don't really want to have the 9
>>>> showing.  Do I inadvertently have some setting on that is giving me
>>>> this?
>>>
>>> Minimal example:
>>>
>>>
>>>
>>> The default chord printer is Ignatzek.  No idea whether this would count
>>> as a bug with the Ignatzek naming framework or not, and how the other
>>> chord printers would behave in comparison.
>>>
>>> As a default, the mismatch between input and output seems weird.
>>
>>
>> Well, we omit the 11 by purpose,
>> See the comment in construct-chord-elements from chord-entry.scm and
>> regtest chord-name-entry-11.ly.
>
> Huh?  Have you taken a look at the output?
>
>> Also quoting "Standardized Chord Symbol Notation" by Brandt/Roemer in
>> section "Dominant Thirteenths":
>> "In accepted usage, the 9th is included but the 11th is omitted. Quite
>> frequently the unaltered 5th is also left out."
>>
>> So no bug, but a design decision.
>
> The problem is not with the conversion of the input to a chord but with
> the conversion of a chord to a ChordName.
>
>> To have the 11th included, one needs to explicitely state it:
>>
>> \chords { e:11.13 }
>>
>> If this is not done, the printing as E⁹ ¹¹ is ok, imho.
>
> \chords { e:13 } is printed as E9 13 rather than E13 .  So the question
> is why the rationale for converting e:13 to chord notes differs from the
> rationale converting the chord notes to a chord name.
>
> --
> David Kastrup

Well,
the printed output of

m =
\chordmode {
    <c' e' g' bes' d'' f'' a''>
    c:11.13
    %% unnecessarily verbose:
    c:1.3.5.7.9.11.13
}

mII =
\chordmode {
    <c' e' g' bes' d''  a''>
    c:13
    %% unnecessarily verbose:
    c:1.3.5.7.9.13
}

<<
  \new ChordNames { \m \mII }
  \new Staff { \m \mII }
>>

looks perfectly fine to me.


Obviously it's _me_ not understanding the issue.


Thus I'll be silent here.

Cheers,
  Harm