./exaile 
Traceback (most recent call last):
  File "exaile.py", line 95, in <module>
    from xl.gui import main as exailemain
  File "/home/albert/Exaile/xl/gui/main.py", line 25, in <module>
    from xl import library, media, audioscrobbler, equalizer, burn, common
  File "/home/albert/Exaile/xl/library.py", line 20, in <module>
    from xl import common, media, db, audioscrobbler, xlmisc, dbusinterface
  File "/home/albert/Exaile/xl/media/__init__.py", line 1, in <module>
    from xl.media import mp3, ogg, flac, wav
  File "/home/albert/Exaile/xl/media/mp3.py", line 1, in <module>
    import mutagen, mutagen.id3, mutagen.mp3
ImportError: No module named mutagen