Multipe artists: only last is showing

I have a lot of classical music, very often with multiple artists. I made my FLAC-files with mediamonkey, and as a separator for multiple artists, the “;” is used (like “London Symphony;Von Karajan”).

WD TV Live only seems to show the last artist (in this case: “Von Karajan”, so the orchestra is not shown).

Is there a solution for this?