Why won't the new iTunes let me transfer my music to my iPhone?

I have the most updated iTunes and iPhone 5 software. I use to be able to click and drag music from my iTunes to my iPhone on the sidebar, but i can't do that anymore and i can't figure out how to transfer my music.has anybody figure it out?

" I use to be able to click and drag music from my iTunes to my iPhone on the sidebar, but i can't do that anymore"

Why not? What happens when you try? Honestly I see questions like this posted by people every day and they make things harder on themselves by failing to adequately describe the problem. Are the song files on your computer (just being on the iTunes screen doesn't prove that they are). Are you set for manual management in iTunes?

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