I used to keep my music files sorted in genre crates / folders, which made it hard to find tracks of a particular type or which fit a specific situation. With my Rekordbox organization process, I tag each song with its genre (or genres) and then place the tracks in crates that fit different scenarios such as:

The location I'm playing
The type of audience or group of people I'm playing for
The sub-genre
The purpose or reason
The special quality such as "sing-alongs"

This system has really unlocked my creativity and made my library much more accessible -- both during set planning, and real time during events.

Content provided by Kevin Summers, owner and DJ at Smilestones DJ Services (http://www.smilestonesdj.com).