Just my two cents:
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I’d love a max-line setting as well. Right now we can only show multiple lines if we enable the composers, which I don’t necessarily need to see.
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Seems like either a localization issue or an error with your tags. As you can see in the following screenshot, my library shows “By:” prefix for the composers, which are separated from the performing artists by a bullet
( • ). The two groups themselves use commas between each name.
These songs only have one composer, but I have verified that multiple composers are also separated by commas. The bullet only appears to separate composers from artists, as far as I can see. (I’ll check if I have a better example.)
Better example:
Clearly shows format of:
"By" composer 1, composer 2 • Artist 1, Artist 2
At least for English.
This was slightly related to my earlier request here, which is why I knew the composers and artists are separated properly.

