Q: I bought a song(which is 5 1/2 minutes long), but it stops playing after 15 seconds and moves onto the next song. I bought this song in a set with 5 other songs, all of which play for full time. Is there anyway to fix this?

If your country's iTunes Store allows you to redownload purchased tracks, I'd delete your current copy of the track and try redownloading a fresh one. See the following document for instructions:

Downloading past purchases from the App Store, iBookstore, and iTunes Store

Otherwise, I'd report the problem to the iTunes Store.

Log in to the Store. Click on "Account" in your Quick Links. When you're in your Account information screen, go down to Purchase History and click "See all".

Find the item that is not playing properly. If you can't see "Report a Problem" next to the item, click the "Report a problem" button. Now click the "Report a Problem" link next to the item.

You're welcome! Glad you got things sorted out.