I've found over the years that there are some that you just cant edit, maybe because of how they were ripped, or, and maybe I'm just being a little paranoid, but because they are trackers, I don't know, so I just delete them.
Look at the attachment, and see how in the comments there seems to be some kind of code, again, perhaps I'm being a little para, but I attribute that to a tracking code of some sort, which is why if I can't edit it, it gets binned.
(yes it's a cheesy tune, but I needed cheesy Christmas tunes =) )....