Re: Double transpose when in tags within music function

[Urs Liska]

Am 09.01.2014 12:55, schrieb Ole V. Villumsen:
> Expected behaviour of the example below: engrave a d (transpose the c to d).
> Actual behaviour: engraved an f. Seems to have done both of the
> transpositions described in the two different tags in the music function
> (transposed c to d, then to f, or the other way around).
>
> \version "2.18.0"
>
> myTranspose =
>    #(define-music-function(parser location theMusic) (ly:music?)
>       #{
>          \tag #'cd { \transpose c d #theMusic }
>          \tag #'df { \transpose d f #theMusic }
>       #})
>
> { \keepWithTag #'cd { \myTranspose { c'1 } } }
>
> The problem seems to be only when the tags are inside a music function (if
> this is not supposed to work, an appropriate error message should be given).
> The problem seems to be only with transposition; other music I put inside
> the tags gets filtered as expected.

If you replace

#theMusic

with

$theMusic

it works as expected.

But I'm sure David can explain you why.

Urs