Re: Entering Chords using Nashville Number System

[Valentin Petzel]

Hello Sam,
(please keep lilypond-user in the address list)

The big problem here is the the chord naming function (which is responsible 
for creating that chordname) does not expect the root name to depend on 
context properties, so it does not pass the context as argument. This means we 
cannot do this from within the root name function.

I suppose there are two paths:
1) Create a new key function that resets the root namer
2) Create an engraver that listens to key-change-event resets the root namer 
accordingly

For the first possibility see the appended file as example. The format here is 
a(b) where a is the diatonic step and b is the alteration to the given scale 
in semitones

Cheers,
Valentin

Am Freitag, 14. Jänner 2022, 20:25:20 CET schrieb Sam Gibson:
> Hello Valentin,
> 
> I appreciate your help. I am not too concerned about alterations at the
> moment (although that may become necessary eventually), but you are correct
> that NNS scale degrees should be relative to the key. It seems that the key
> defaults to C major. That is, a C chord is 1, G is 5, etc. Do you know of a
> way I can set the key so that all scale degrees will be relative to that
> key? For example, setting the key as G major so that G is 1 and C is 4.
> 
> Thank you,
> Sam
> 
> On Fri, Jan 14, 2022 at 1:14 PM Valentin Petzel <valentin@petzel.at> wrote:
> > Hello Sam,
> > 
> > Sure, just use (number->string (1+  step)) to increment the number by 1.
> > Generally it is possible to do more, but you’d need to specify what is
> > needed.
> > After all most of us probably have no real knowledge about the Nashville
> > System. For example this does not yet incorporate alterations (like Eb in
> > C
> > major), for which I do not know how this should be done.
> > 
> > Also things like: As far as I can see the NNS uses scale degrees for
> > chords,
> > so I suppose it should probably be relative to the key. If that is so I
> > suppose I could do something for this.
> > 
> > Cheers,
> > Valentin
> > 
> > Am Freitag, 14. Jänner 2022, 16:58:35 CET schrieb Sam Gibson:
> > > Hello Valentin,
> > > 
> > > Thank you for your help! Your solution works for my project; I only need
> > 
> > to
> > 
> > > display chords in the number system.
> > > 
> > > One small detail: is there a way I can make the indexing start at 1
> > 
> > instead
> > 
> > > of zero. Right now, the root cord is denoted by 0, and I would like it
> > > to
> > > be 1. As, you can tell, I am not very experienced with using functions
> > > in
> > > Lilypond :)
> > > 
> > > Thank you,
> > > Sam
> > > 
> > > On Fri, Jan 14, 2022 at 6:38 AM Valentin Petzel <valentin@petzel.at>
> > 
> > wrote:
> > > > Hello Sam,
> > > > 
> > > > What do want? ENTER chords in this system, or DISPLAY them in this
> > 
> > system,
> > 
> > > > or
> > > > both? I know nothing about this system, but you can specify what
> > > > symbol
> > > > gets
> > > > printed for chord roots like this
> > > > 
> > > > \version "2.22.1"
> > > > 
> > > > \chords {
> > > > 
> > > >   \set chordRootNamer =
> > > >   #(lambda (pitch lowercase?)
> > > >   
> > > >      (let* ((step (ly:pitch-notename pitch)))
> > > >      
> > > >        (number->string step)))
> > > >   
> > > >   c1 f:sus4 }
> > > > 
> > > > Cheers,
> > > > Valentin
> > > > 
> > > > Am Freitag, 14. Jänner 2022, 03:46:49 CET schrieb Sam Gibson:
> > > > > Good day.
> > > > > 
> > > > > I wish to use the Nashville Number System, using numbers in place of
> > > > 
> > > > chord
> > > > 
> > > > > names, for a simple lead sheet or chord chart. While it is possible
> > 
> > to
> > 
> > > > > simply enter and position chords using \lyricmode, I do not know of
> > > > > a
> > > > > way
> > > > > to include the superscripts such as maj7 or sus4. Is there a way to
> > 
> > use
> > 
> > > > > '\chords' and replace the letter chord names with numbers?
> > > > > 
> > > > > I am entering chords in the following way:
> > > > > 
> > > > > \version "2.22.1"
> > > > > \chords { c1 f:sus4 }
> > > > > 
> > > > > I appreciate any assistance.
> > > > > 
> > > > > Samuel Gibson

NNS.ly
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