Displaying 'Tag' preceded by 'AnotherTag'

[Kryptik]

After a bit of playing around with your solution I found that it was necessary to add ContentGroup into either the indexTag or itemTag. I favoured the latter then discovered where I'd gone wrong (though to be fair I have slightly moved the goalposts and created a new virtual tag for the result).

I was pretty close with my original as it turned out. As you highlighted the sticking point was, "No tag would be added if the item already has...[that same tag]". I should have done the following:
aliasTags >> ContentGroup:Composition, ComposerSort:Composer Sort
indexTags >> Composer Sort, Composition, ComposerWork
tagFormat >> ComposerWork.indexFormat={$Composer Sort$Composition}

Neither way has sorted the result as I hoped, instead it sorts according to the composer portion first, but that can solved another day.

Thanks for the assistance and superb software.