Q: What does this ((.)) mean in Itunes under name of song?

I am a supporter of WMVY Radio and periodically they send me hyperlinks of full songs by artists to add to my Itunes library.  When you drag and drop the links into Itunes they usually appear like examples 5-8 in the above screen shot.

My problem is that I stupidly cleaned up the way the artist name & song looked for asthetics but found out after I did, the files no longer play.  Am I out of luck in recovering these songs.  They are 1-4 in the above screen shot.  I am trying to figure out if the hyperlink as it appears when you drag and drop into Itunes is the only active script possible to play the songs and if altered, will not work.

Thank You for your insight.  The URL's are no longer active.  It is only a few files lost and I now know better than to edit them.  Again, thanks.