Re: conditional parenthesis

Thanks.  That mostly works.  Where I'm having an issue now is with 
relative pitch.

Here is a sample along with what I notice with the display.

\version "2.26.0" \language "english" par = #(define-music-function 
(note) (ly:music?)    #{    \tag #'(piano)  { $note }    \tag 
#'(guitar)  { \parenthesize $note }    #}) music = \relative c' {r8 b16 
cs gs'4 b,16 cs gs'8 \par cs,8 <a cs e>~ |} \score {   {     
\keepWithTag #'piano {\music}   } } \score {   {     \keepWithTag 
#'guitar {\music}   } } \void \displayLilyMusic \keepWithTag #'piano 
{\music} \void \displayLilyMusic \keepWithTag #'guitar {\music}

It seems that the octave is getting confused in both cases.

{ \absolute {

r8 b16 cs'16 gs'4 b16 cs'16 gs'8 { \tag #'piano {cs'8 } } < a, cs e >8 ~ |

} }

{ \absolute {

r8 b16 cs'16 gs'4 b16 cs'16 gs'8 { \tag #'guitar { \tweak parenthesized 
##tcs8 } } < a, cs e >8 ~ |

} }

On 7/4/26 12:28 AM, Thomas Morley wrote:
> Am Sa., 4. Juli 2026 um 07:50 Uhr schrieb Walt North<[email protected]>:
>> I have a case where I need to put parenthesis around some notes (not all notes) for a given instrument to emphasize a specific thing at certain points.
>>
>> I thought this might be a case where tags would come in handy.
>>
>> But the following doesn't add the parenthesis. What am I missing?  Is the problem related to having tags within a function? Or would there be a better way to do this.
>>
>> \version "2.26.0"
>>
>> par = #(define-music-function (note) (ly:music?)
>>     #{
>>     \tag #'(piano)  { #note }
>>     \tag #'(guitar)  { \parenthesize #note }
>>     #})
>>
>> music = {c'1}
>>
>> \score {
>>    {
>>      \keepWithTag #'piano {\par \music}
>>    }
>> }
>> \score {
>>    {
>>      \keepWithTag #'guitar {\par \music}
>>    }
>> }
>>
>>
> Two issues:
> a)
> \parenthesize works on a single note or event-chord.
> Your `music` is sequential music, though.
> Thus {  \parenthesize { c'1 } } does not work.
> b)
> In the function you do #note. This _changes_ `note` for all instances
> of the function.
> Use a copy instead, i.e. $note
>
> As long as you only want to parenthesize single notes below works here:
>
> par = #(define-music-function (note) (ly:music?)
>     #{
>     \tag #'(piano)  { $note }
>     \tag #'(guitar)  { \parenthesize $note }
>     #})
>
> music = c'1
>
> \score {
>    {
>      \keepWithTag #'piano {\par \music}
>    }
> }
> \score {
>    {
>      \keepWithTag #'guitar {\par \music}
>    }
> }
>
>
> Cheers,
>    Harm