Why?

Well, try it! (first backup your album) :

First make an MD5 file for an album folder (as explained before).

Then just change one of the songnames a little bit, and open the MD5 file. It will tell you that one file is corrupt, and the rest OK. Which file? Well, the one you have just changed the songname of! See? ;-)

Now change the songname back to the original. (If you run the MD5 again all files will be OK again.)