How to get music onto iphone?

I have music that has not been downloaded from itunes but I want to get it on my iphone, I have itunes up to date

It won't let me drag and drop or copy and paste

Someone please help me?

I have the iphone 4s by the way

Added (1). I've worked it out now - thanks.

Just download an app called iTube and you can download any song onto your phone, not onto iTunes but it will be there until you choose to delete it

Easy, just do file-add in itunes and add any mp3 etc to your itunes list. Then copy to the iphone, I do it all the time with mp3 files.