os.path.split() only even splits into two components, which means that
path templates that have more than two parts (e.g., `%A/%d - %y/%X`)
will not get split properly for the purpose of added disambiguation
parts to them.
os.path.join() will still work fine to splice the split template back
together as it takes an arbitrary number of arguments.
Make MusicBrainz consistently written as "MusicBrainz" and not
"musicbrainz" or "Musicbrainz".
Doesn't change instances that refer to the Python module or similar.
