moOde 6.0 compilation roll-up

[David]

Thank you very much, Kent and Duke.g for your help. Yes, my mp3-files really had two sets of tags (I had no idea!). I'm glad I have now cleaned that up, but it wasn't the cause of the problem. And I did use "AlbumArtist" in the mp3-files. But I made a strange discovery. When opening the files with "easytag" on linux (I had been using exfalso/Quoe Libet before), the AlbumArtist field was empty! After filling it with the appropriate information with easytag and looking at the result in exfalso, it turned out, that in addition to the "AlbumArtist" field there was now a "Performer" field. This was a surprise to be, because a performer of a track does not necessarily have to be the artist of the whole album. Still, filling the "Performer" field did the trick of enabling the roll-up of compilations for my mp3-files.