An option that would allow one to specify 'not this kind of song' is welcome. At the moment it seems the program mainly prefers hard bassdrums and easily find similar songs in that range. To avoid this we could use something in which we rightclick on a song and specify 'not this kind', which should alter the dcolor distance such that song that are the furthest away from the 'not wanted' and closest to the 'wanted' are selected.