Select all artists that are not album artists

[so_la_la]

Hello,
how can I select songs from all Artists that do not in any form appear as Album Artists? I wish I could turn the respective songs into a playlist or sth. as it sis required by Logitech Media Server to function properly.
Thank you very much

Edit: By this I mean both songs that do not have an album artist at all plus those that have album artist=various.

[phred]

Custom Search where
<Album Artist> "has no value"
and
<Album Artist> contains "various"
Be certain to set the match to "any"