Why won't iTunes let me play songs before I purchase them?

I jus started noticing this problem last night. I have an iPhone 5c. When I go into the iTunes Store and click on charts if I want to hear a song before I purchase it I click on it but it doesn't play, this does it to every song. Someone please help.

How to get my ringtones back?

I have bought many ringtones and alert tones whilst I have had my iPhone 5, and they are usually found when I select 'Sounds'. However, they have disappeared! I don't want to purchase them again, but I really want them back. How do I do it?

IPhone user blocking iPhone user?

If I have an iPhone and I block someone else who has an iPhone will there messages send as text messages instead of iMessages? Or will they just keep sending as "delivered" iMessages no matter if my phone is on or off?

How to get glue to come off my iPhone 5c?

I've got glue on my phone and I was just wondering how I could get it off. Some people have recommended nail varnish remover however I was wary weather to as I was worried the white cover one the iPhone 5c would be removed with the glue.

Why is my iphone 4s microphone not working?

After i updated my iphone 4s to the ios7.1 my microphone has not been working, people can hear me on normal phone calls but not on facetime or when i video something on snapchat, its really quiet, what can i do?! Someone please help?!