[tablatures] open tunings

[Federico Bruni <brunology@xxxxxxx>]

Hi all,

I've happened to write some guitar pieces in open D tuning (DADF#AD),
so I've noticed that in scm/output-lib.scm there's only the open G 
tuning for guitar (line 92):

; default tunings for common string instruments
(define-public guitar-tuning '(4 -1 -5 -10 -15 -20))
(define-public guitar-open-g-tuning '(2 -1 -5 -10 -17 -22))
(define-public bass-tuning '(-17 -22 -27 -32))
(define-public mandolin-tuning '(16 9 2 -5))

I think it would be useful to add a definition for open D, as it is 
used maybe more often than open G (at least for my experience).

This would be the definition for output-lib.scm:
(define-public guitar-open-d-tuning '(2 -3 -6 -10 -15 -22))

This way, open D tuning could be set much more easily.. with no need 
to count ;-) :

\set TabStaff.stringTunings = #guitar-open-d-tuning

And that could be a good reference to start from for those who need a 
similar tuning, like DADGAD, as you need to change just one note.


I don't know which is the rationale for tunings in lilypond config 
files: keeping it simple or offering many possibilities.. (for 
example, we may add dropped D, open E and maybe something else..)

I've searched the archives and I was not able to find any previous 
discussion on this subject..

Let me know what you think.

Cheers,
Federico