When producers look through their music library they need to have an instant access to what they need,and it is all put into a database under categories.
So apart from the title of the track it needs to be broken down into instrumentation,BPM,mood etc:

e.g.

Title                   "In or out",
Instrumentation Pads,strings,bass,
Mood                   Tension, Suspense
BPM                     90
Genre                  Classical

It is sent in the form of labelled cd's(with a spine),which should clearly show the genre.
Why?
Because when the producer needs Rock,thats the first thing he looks for.