Displaying 'Tag' preceded by 'AnotherTag'

[simoncn]

Welcome to the MinimServer forum!

From this section of the MinimServer user guide:

The indexFormat option doesn't replace any existing tags in the item. For example, the option
WorkByTitle.indexFormat={$title$tonality$opusnumber$subtitle}
would add a WorkByTitle tag if it doesn't exist in this item. No tag would be added if the item already has a WorkByTitle tag. This limitation doesn't apply to the Artist tag.

Because you already have a Composition tag, the Composition.indexFormat option is leaving this tag unchanged.

You should be able to do what you want with the following:

aliasTags >> ComposerSort:Composer Sort
indexTags >> Composer Sort, Composition
tagFormat >> Composition.indexFormat={$Composer Sort$ContentGroup}