Re: switching between halved and full note values

[David Kastrup]

Graham King <address@hidden> writes:

> I use lilypond to prepare modern-notation editions from mensural
> notation.  Many performers prefer to have the original note values (lots
> of breves, longs, etc.) but it is quicker in lilypond to enter the notes
> as half-value.  In other words, it is quicker, and more readable, to
> enter
>     c1 c2 c1 c2
> than
>     c\breve c1 c\breve c1
> etc.
>
> To make the conversion easier, I've finally plucked up the courage to
> delve into Scheme for the first time.  In the hope that it will be of
> use to someone, here is a way to parameterise the conversion.  The
> example below adjusts notes, time signature, and triplet spanner
> appropriately, and will hopefully serve as a guide for automating other
> similar conversions.  I write the lilypond code using half-values, and
> uncomment either line 2 or line 3 as appropriate:
>
>
> \version "2.16.0"
> %$(define HALFTIME 0) % for note values of original MS
> $(define HALFTIME 1) % for halved note values
>
> music = \relative c' {
>     \time $(cons 4 (+ 1 HALFTIME))

I'd use # rather than $ in all those instances.

>     c2 d e f 
>     \once \set tupletSpannerDuration = #(ly:make-moment 1 (+ HALFTIME
> 1))
>     \times 2/3 { g4 a g a c b } c1

Well, from 2.17.11 onward, you can just write

    \tuplet 3/2 2 { g4 a g a c b } c1

and it will scale nicely under \shiftDurations.  Maybe \time should be
made to do so automatically as well.

-- 
David Kastrup