New itunes won't let me download music to my iphone, how do I fix this?

So I downloaded a couple of songs off youtube, and usually I can just sync and the music will be on there, but I downloaded the new Itunes and I can't figure out how to do it. The songs are in my library and Itunes keeps telling my phone can't be backed up also when I plug in my phone, it is highlighted grey like it's not selectable.

You need to make some space for data on your phone. That way you will be abled to listen to music.

  • 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?
  • Why won't itunes let me download songs onto my iphone? Ok so i used youtube converter to convert a 3 minute song and usually it always works but anyway, i got it downloaded onto itunes but when i try and drag it to the devices section where my iphone information is, it won't let me, it just has a red circle with a line through it. Does anyone know how to get the song onto my phone?
  • Why won't iTunes let me download music to my iPhone 5? I have the music on my laptop and before I could just plug my phone up to my laptop and open the song in iTunes and drag it over to my phone. But I got a new iPhone and laptop and its not working.
  • Why doesn't iTunes let me download music from my iCloud? Ok so i bought a lot of music today on MY iphone from iTunes from my phone, so then my dad wanted me to download some to his phone, so we use the same Apple ID, and not all of the music on my account is downloading to his phone, I have 160 songs and only 80 downloaded. What do I do, I also tryed to look for hidden purchases on his phone but It's not there