I tunes
I have 450 songs purchased on Itunes and 17 on my phone How can I get all my songs on my phone and ipad?
iPhone 5, iOS 7.1
You should be transferring anything purchased on your iphone/ipod/ipad to your computer regularly. File>Device>Transfer Purchases
Everything should be stored on your computer. Simply sync whatever you like from your computer to your idevice.