As you are going through everything, check the condition of the music. If it was something published eons ago and is POP, missing scads of parts or scores, and looks like it hasn't been played since Eisenhower was president...TOSS IT! Relax...chances are good that it isn't on the PML anyway, and even if it's a quality piece the chances of you being able to replace parts/score are slim to none.

If the title of the piece is, "The Capitan & Tenile's Greatest Hits"....TOSS IT! That hasn't been played since Carter was president...for a reason. I don't want to come across as anti-"pop" music, but one has to remember that "pop" music has a limited lifespan, and is maybe played one time before being relegated to the back of the filing cabinet. Sure, you could save a couple of them for sight-reading practice, but be selective about which ones you keep. I can remember in high school that we did a piece for SR prep called "Dickie's Dream". When we started playing it, it sounded tonality-wise like it came from the mid-50s. Sure enough, copyright 1956. I think we got about a third of the way through it and started laughing because it was such a hokey piece.