My CD s that I put on my iTunes won't upload onto my iPhone, why?

I uploaded all my CD s onto my iTunes on my computer, I have the most updated version of iTunes. I plugged my iPhone in and its linked to my laptop but it will not let me put the songs on my phone, why? This has just been happening this month, it always has let me before.

You can just rip your CD to mp3 using windows media player, then you have mp3s you can just add to your itunes list etc

  • Why won't itunes sync my CD onto my iphone? I brought two albums and put them on my itunes but when I plug my iphone into my laptop the two albums won't go on to my phone? Why is it doing this and how can I make it work? Its been frustrating me for months! Also before when I had a blackberry ages ago I put videos up from when I went to see lady gaga on my laptop, can I put those videos onto my iphone to?
  • Why won't songs I downloaded from youtube transfer onto my iphone from iTunes? I used an mp3 converter to download songs from youtube to itunes, and then download them to my iphone. I have done this with possibly close to 70 songs. But I just tried it with about 13 songs and it won't transfer, and it shows a little gray dashed circle next to the check mark on itunes, and it will play from itunes, but just won't transfer to my phone.
  • Why won't my iTunes sync my music onto my iPhone? When I plug my iPhone into my laptop and open iTunes to sync my music, it starts to back up all my things onto my computer but it never actually goes passed the backing up, it just stays on that. I've left my phone being plugged into the laptop for over 2 hours and when I returned it said it was still backing up. I want my music on my phone but I don't know why it won't work, help?
  • Why won't iTunes let me put certain songs onto my iPhone? ITunes used to work fine until recently. Now there are certain songs or artists that won't drag and drop onto my iPhone. Any answers?