Song off iTunes won't play on iPhone 5?

I downloaded a song off iTunes onto my new iphone 5 on the phone itself using the app, it sometimes plays but today I press pause then play and it just won't work but all the other songs work which were also downloaded on my phone off iTunes, does someone know how to fix this?

Try deleting it and downloading it again?

Maybe try re starting the sog and press play or call apple.

(the number is 1-800-MY-APPLE )