Can't download on the iTunes app?

At first I thought it was just a simple probem but now? I've tried downloading songs but they won't download I've gone into purchased on iTunes but the option with the cloud doesn't show up it only says downloading beside the song. I've tried going into my songs and pressing the cloud with the arrow beside the song but no matter how long I wait, it will always say "unable to download at the time" i've pressed retry a number of times but still nothing's happening. I put in a 25 dollar gift card earlier so money isn't the problem please help? I have a iPhone 4S

There are 2 ways to get an app onto your device.

1. Sync through itunes

2. Download by app store app on the device.

if you can't get the app through an itunes connection get a Wi-Fi or 3G connection and get the app wirelessly.

and if the itunes issue persits uninstall + reinstall itunes.