First let me say, great program! It was the support for sorting by album artist that drew me to it, and it was the other features that made me fall in love with it in less than an hour. However I've noticed a bug, when you sort by album artist, and a song has no album artist, it simply doesn't show up, at first I thought the songs failed to load into the library, so I decided to search the artist name, and it popped up in the album and song panes, just not the album artist pane. The issue is when the album artist tag is blank it isn't showing it, but this is a bug, because the correct way for a media program to handle this is to search artist when album artist is blank, and if both are blank then to put it under Unknown Artist. I wouldn't imagine that this should be a real hard bug to fix, but I feel it is very necessary. For a workaround I'm going to try to make a smart playlist for blank album artist, and manually add the tag to any that don't already have it.