Why won't iTunes let me put songs on my iPhone?

So I downloaded Eminem's new album from iTunes, and whenever I try to drag the album from my library to my phone, it comes up with a red circles with a line through it where my cursor is, why?

I know I have enough space on my iPhone, but I haven't updated it to iOS 6.1.3 yet (I have a 3GS, cause I'm cheap like that) so is that the problem?

Try updating your iPhone and if that doesn't work then try connecting the iPhone to your computer correctly. You may find that if neither work, then going to the apple website and going to the troubleshooting page/FAQ section would be of more use.

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