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Do you use genre or a key/custom word to identify the songs or just basic information [name, artist, year, etc]? If you do use the first, you may be able to use Collection>Swedish tunes and Waltzs, then select genre or a key/custom word in 'search all fields'. You will need at least 2 different fields the primar[ies] and subset[s]. Just selecting Collections>Waltz's and the genre or a key/custom word in 'search all fields' may do the elimination sort. You will need some sort of specific secondary identifier to make any kind of specialized sort. In this case if you have labeled all the waltz's by genre or all Swedish songs with a custom word it should be possible to do a specialized sort.