Don't rename these files in mp3tag otherwise you'll mess up your iTunes. What I do is firstly open up iTunes, sort the iTunes Library by album (makes sure what you do next works properly). Play the 1st song and leave a paperweight resting on the right arrow key.. Go for a walk, dinner or whatever and when you come back iTunes will have updated the _FILENAMES. This only works if you have 'Keep iTunes media folder organised' in the perferences.
Whereas before there may have been two _FILENAME
Title Goes Here
Title Goes Here (01)
Now you have only:
Title Goes Here (01)
iTunes can then rename it back to 'Title Goes Here' as none exist.
There is also this post which can do something similar.
Tagged everything but does not reflect in ITunes / else