compare files between folders python

folder_comparison.py

*******************
import os
file_list1 = []
file_list2 = []
for top, dirs, files in os.walk('./'):
    for nm in files:
        file_list1.append(nm)
for top, dirs, files in os.walk('/Users/<user>/Music/iTunes/iTunes Media/Music/'):
    for nm in files:
        file_list2.append(nm)

songs1 = [file for file in file_list1 if file.endswith( ('.mp3','.m4a', '.m4p') ) ]
songs2 = [file for file in file_list2 if file.endswith( ('.mp3','.m4a', '.m4p') ) ]

set1 = set(songs1).difference(songs2)
set2 = set(songs2).difference(songs1)

print "files only in itunes media:"
print set2
…