Did you try the genre function in SKJB? If you have your music setup like :
C:\Music\Rock
C:\Music\Metal
etc,
you would put in a path of 'C:\Music' and tick the 'First Part Of Directory Is Genre' box under the directory list.
When you load the program, the list of genres are displayed, and can be displayed again using the 'Switch Genres' key (see the Key Mapping section for the value of this key, and change it if you wish).
If this solution does not suit, please let me know.