This does not work with the album tag as indicated if you read the help for 
the field Multible Items In Tags under Server Settings / Behavior.

It does work very well with the artist tag and with the genre tag.

But not with album (and track-no). I think it would be perfect if there was a 
connection between album-name and track-no:

If af file has album-tag = "album-1;album-2" and track-tag = "04;08" the 
result should be 2 entrys, one with album="album-1" and track="04" and another 
where album="album-2" and track="08"

If the artist (or taag) contains a seperator as well this should lead to more 
entrys. If artist tag is set to "Artist-1;Artist-2" the result should lead to 
4 entrys:
Artist-1, Album-1, 04
Artist-1, Album-2, 08
Artist-2, Album-1, 04
Artist-2, Album-2, 08