title: ImportError: No Module named 'mt_exceptions' when using Mingus library
body: <p>Forgive my ignorance in advance, I am very new to python. I am trying to use a python 3 version (<a href="https://code.google.com/r/artdent-mingus-python3/" rel="nofollow">https://code.google.com/r/artdent-mingus-python3/</a>) of the Mingus library (<a href="https://pypi.python.org/pypi/mingus/" rel="nofollow">https://pypi.python.org/pypi/mingus/</a>) in 3.4.2. When trying to use the note module, I keep getting the ImportError listed in the title.</p>
  
  <p>Based on my research on similar ImportError questions, I have tried the following things:
  -I made sure there was a mt_exceptions.py file in the relevant directory
  -I made sure each mingus directory in the site-packages directory has <strong>init</strong>.py file
  -I deleted the .pyc files in the mingus directory</p>
  
  <p>Any pointers on what I might try next?</p>