There is nothing wrong with them. I checked those four files and was able to d/l all four of them in their entirety. Apparently you didn't read the stickied post in this forum before you posted this thread(
Before You Say a File is Corrupted Try This). If you had of, then your problem would have been solved. And just to prove to you that what I just said is the truth....
This shows your post and where I d/l all four songs completely.