My downloaded music won't drag into my iTunes

When I open my downloads file on my computer, and open my " on this iPhone " tab in my iTunes, and try and drag my downloaded song into the tab it has a red circle with a slash, and it won't sync my music into the " on this iPhone " tab. I don't understand why it's doing this, because before I updated my iTunes it worked. I tried to re-install iTunes and it's still not working Help?

It all depends on what version of iOS you are running on your iPhone if your I phone is not up to date and you installed the newiest version of I tunes it may not be comparable with the processer that is running your I phone and also try restarting your computer if you just installed iTunes is a big program so needs to register all the new files

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