How to play mp3 on iPhone 5?

My iPhone 5 just came in and I'm trying to get my mp3 files onto it. The files are saved on my PC and I'm trying to transfer them using iTunes. But when I drag the files onto iTunes, it tells me this:
"xxxxx.mp3" was not copied to iPhone "xxxxx" because it can't be played on this iPhone.

Am I missing an app? If so, what's a good app for the iPhone to play mp3 files?
If it's not a Mac issue, how do I get the phone to play these mp3 files?

How fast would my internet on a iphone 5 be for me?

I live in dorset in the uk and will be getting an iphone 5 on t mobile and will be using 3g even though I will be using same network will the iphone 5 speed make a difference to internet speed compared to my phone I have now which is a motarola defy. Sorry if it isn't very clear I tried to explain my situation the best I could.

Can texts be transferred from my Andriod to my iPhone?

I'm getting an iPhone 5 tomorrow. Right now I have an Andriod and I have a lot of texts between my boyfriend and I. I've been saving some them for two years, because they are cute, etc. I don't want to lose them. Is is possible to transfer them from Andriod to iPhone?

Right now I'm using my old Samsung Galaxy Gio, I'll be getting an iPhone 5.

Not hate comments on Andriod vs.iPhone. I appreciate both, everyone is entitled to their own opinion.

My iPhone 4s doesn't have Siri?

I got my iPhone 3 days ago. I'm absolutely used to the system due to the fact that I've had my iPod 4g for 2 years. My brother also has 4s and Siri works perfectly fine. However, on mine, Voice Control pops out instead. I went to settings > general and there was no Siri to turn on. I'm sure it is 4s because it has all the physical characteristics of it. Please help! Thank you!

Added (1). If I press the home button for 2 seconds, Voice Control comes out. Not Siri. I know the difference. I get the blue voice control like on the Ipod touch

Want to buy Iphone 4.were can I get it?

I want to get the Iphone 4 but its to expensive… And my dad says if I want I have to buy it w/ my own money… At&T is way to expensive and amazon and ebay are to does anyone know were i can get a good quality Iphone for a cheaper price.
-Thanks

IPhone 4 rear camera lenses scratches?

I have an iPhone 4 and just recently noticed that the rear camera has tons of little scratches. When taking a photo, the image itself is super foggy and discolored. The image will not focus on anything either. Does anyone know if this would be covered under the warranty? If not, any tips on how to fix the problem?

How to backup a broken iPhone onto itunes?

Today I dropped my iPhone and it seems to plug into itunes fine. It says that it recognises my device ben's iphone but I can't backup my photo's because the passcode lock and I can't unlock it because my lcd screen is dead. So can someone tell me how I can bypass that passcode thing and backup my important photo's from my iphone.