Currently Being ModeratedAug 30, 2013 7:49 AM (in response to bholdrofjustice)
Thanks for visiting Apple Support Communities.
You may want to delete the song that doesn't play, and download it again using the steps in this article:
Downloading past purchases from the App Store, iBookstore, and iTunes Store
If the song still skips after 8 seconds, you can report an issue with your purchase:
How to report an issue with your iTunes Store, App Store, Mac App Store, or iBooks Store purchase