Why can't i get music to play on my Iphone 4?

So my mum has asked me to put music on her iphone 4 for her but when i download music from itunes it shows up but won't let you unpause it to play the music she can get sound alerts and videos with sound off the youtube app but no music at all can anyone help thanks.

Go to the Apple website.
Download the manual for the device in question.
Read it.

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