Re: Re: Chords and what they mean

[70147persson]

Well, time to thank you all for your efforts to get me understand what I 
am doing. As (almost) usual there already exists a solution in LilyPond, 
but it is  hidden by so much else, so you do not find it. In my country 
we sometimes say that "you do not see the forest because of all the 
trees" (in a home made ugly translation!).

I had already discovered the "chordnameexceptions", but as I do not know 
the Scheme language (yet), I had not seen exactly how to use it. And the 
explanation in the Notation Reference is really not very exhaustive. So 
the construct with "powerChordExceptions" was new to me, as well as that 
with "\powerChords". Even if I had already come in contact with power 
chords and roughly understand what they mean, it was first after 
following your advice, I found them in the "Guitar" section. I had 
really not looked there, as my target was a piece of piano music.

But thank you everybody for your contribution to my new knowledge.
/Kaj

On 2015-09-17 13:29, pls wrote:
> Thomas Morley <address@hidden> writes:
>
> > 2015-09-17 10:47 GMT+02:00 Simon Albrecht <address@hidden>:
> > > Hello Kaj,
> > >
> > > On 17.09.2015 09:27, address@hidden wrote:
> > > > First I will declare, that I am not 100 percent sure this is a bug, but
> > > > friends of mine, musicians, say it probably is. Also, as I am not an expert,
> > > > I have tried to learn by searching on among others Wikipedia.
> > > >
> > > > It is about chords, a few of them. It started when I should clean write a
> > > > score from a manuscript. In one measure there were noted two chords, C5 and
> > > > C. Obviously not the same, as they stood just beside of each other. A search
> > > > on Wikipedia also told me, and this was also confirmed, the author's
> > > > intention, that C5 means C(no 3), hence <c g>, while the chord C means <c e
> > > > g>. But LilyPond treats these two the same and produces the same notes. This
> > > > is also clearly said e.g. in Appendices A.1 and A.2 of Notation Reference,
> > > > as well as in the text part. However even if possibly a correct procedure,
> > > > is it a correct practise?
> > > >
> > > > Another such discrepancy is about Csus, which Wikipedia (and my friends)
> > > > says is equivalent to Csus4, hence <c f g>. But LilyPond produces <c g>,
> > > > hence what should come from the notation C5 as in the previous paragraph.
> > > >
> > > > So, what is the truth?
> > >
> > > There are others who are more into the subject, but I may say:
> > > There is no ‘truth’. With chord names, there are so many different
> > > conventions and fiercely defended convictions that it’s impossible to define
> > > a single ‘standard’ naming scheme. (Edit: just like the NR says)
> > Very true.
> > It's a mess, but LilyPond can handle it. ;)
> >
> > > Many things in the chords rendering may be overridden in LilyPond. In case
> > > you’re not aware yet, check out
> > > <http://lilypond.org/doc/v2.18/Documentation/notation/displaying-chords#customizing-chord-names>
> > > and perhaps the LSR <http://lsr.di.unimi.it>. If that doesn’t cover your
> > > wishes, you may come back with a code example, I’d suggest.
> > >
> > > HTH, Simon
> > chrds > \chordmode {
> >      \set chordNameExceptions >       #(append
> >               powerChordExceptions
> >               ignatzekExceptions)
> >      c:1.4.5
> >      c:1.5
> >      \notemode {
> >      <c' f' g'>
> >      <c' g'>
> >      }
> > }
> >
> > <<
> >      \new Staff \chrds
> >      \new ChordNames \chrds
> > If it's not sufficient you can set your own 'exceptions' for
> > chord-naming, see the links Simon provided.
> >
> > HTH,
> >    Harm
> It's not necessary to define power chord exceptions.  They are already
> defined. All you have to do is:
>
> chrds =
>    \powerChords
>    % e.g.
>    \chordmode { c,:1.5 }
>    % or e.g.
>    <c, g>
>    }
>
> <<
>    \new Staff \chrds
>    \new ChordNames \chrds
> BTW: The power chord examples here:
> http://lilypond.org/doc/v2.19/Documentation/notation/common-chord-modifiers
> are not complete. The chord names are missing.
>
> hth
> patrick