Parts of album in iTunes Store in different file formats
I bought double album in itunes store. Part of it is in .m4a format, and other part is in .m4p format. Why?
iPad 2, iOS 8.3
If it was an old purchase that your re-downloaded, the re-download will be in M4P if the original purchase was in M4P.
If it was a new purchase, you should be getting only non-DRM (M4A) files:
All iTunes Store music and music videos for sale now are in iTunes Plus format.
If that is not what you received, contact iTunes Customer Service and get it corrected: