The example for the subject line would be a 2-disc set of an album, i.e. Pink Floyd's The Wall. If the album has the same name for two discs, and there are duplicate track numbers, Mezzmo organizes them firts by track number and then alpha. So in the case of The Wall, the first songs from each disc follow in succession, rather than ordered first by disc number (i.e. 1/2 2/2) then by track number. It should respect disc number so that the tracks run in the correct order across a 2-disc set.