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Muse sequencer uses this script
maybe it can be adapted

#!/usr/bin/python
# -*- coding: utf-8 -*-
#=============================================================================
# MusE
# Linux Music Editor
# $Id:$
#
# Copyright (C) 1999-2011 by Werner Schweer and others
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the
# Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
#=============================================================================

import os
import string
import shutil

dirlist = os.listdir(".")

wavs=[]

print "muse-find-unused-wavs - check wav file usage in all *.med files in current dir."
print ""
print "This utility scans all med files in the current dir, maps their"
print "wave file usage to what is currently available in current dir."
print "The output is printed."
print "Files no longer used are moved to the subdir 'unused'"
print "Press enter to continue."
print ""
raw_input()

for line in dirlist:
if (line.endswith( ".wav")):
#print "HA!", line
wavs.append(line)
print "===================================================="
print "===================================================="
print " These wave files were found in current directory:\n"
if wavs == []:
print "No files were found."
sys.exit(0)
else:
for f in wavs:
print f

for line in dirlist:
if (line.endswith( ".med") ):
#print "HO!", line
med = file(line)
for line in med:
for wav in wavs:
if line.find(wav) != -1:
#print "found %s removing %s"%(line, wav)
wavs.remove(wav)

print "===================================================="
print " These wave files were unused:\n"
if wavs == []:
print "None"
else:
for f in wavs:
print f

print "moving to new subdir unused, press Enter to continue"
raw_input()

try:
os.mkdir('unused')
except:
pass
for f in wavs:
shutil.move(f,'unused')
print "===================================================="
print "===================================================="