As I stated before in Urban's thread, my collection is divided into two parts and kept separately from each other.
My CD and vinyl soul collection is arranged alphabetically, first according to label, then sub organised according to catalogue number.
And God have mercy on anyone that fu
cks with it.
I also have (for the Northern Soul comp CD's) a very weighty file binder (see pic below) organised in alphabetical order, according to song title > artist > CD title > CD catalogue number.
That way I can put my finger on any song much quicker than trying to remember which CD it's on.
All other genres are arranged alphabetically by artist.