Some songs won't sync to my iphone?

On iTunes on my computer, some of my songs won't sync to my iPhone even though they are ticked in the playlist and music library and both of them are set to sync on the iPhone part of iTunes. They all sync every time except the 5 or 6 that don't and there's no difference between the ones that do and don't sync. The songs that don't sync have been on my iPhone before but I download all from my computer iTunes, but when I don't like a song that is on my iPhone, I delete it from my iPhone so it's still on iTunes on my computer if I want to sync it again.

Any help please?

Why don't you just copy paste them?

  • Why won't't songs sync to my iphone 4s? My iphone and itunes have up to date software and this past time when I synced my phone some songs that were already on my phone now skip and show the still downloading circle and songs from my new CD won't upload to my phone at all. I've tried restarting the phone, deleting/readding songs, etc and nothing has worked.
  • Why is it that sometimes i sync my iphone some songs get deleted for no reason? Sometimes when i sync my iphone (especially when i sync a lot of songs) other songs just seem to disappear from my iphone and i have to re-add them to my library to get them back on my iphone. Why does it keep doing this?
  • Songs in itunes won't sync to ipod but will sync to iphone? So i have over a 1000 songs in my itunes library and they will all sync to my iphone no problem. But when i try to sync to my ipad (which has enough memory available) it will not.
  • Songs from PC won't sync with iPhone? So I downloaded some royalty free songs and added them to my iTunes library but when I connect my iPhone and try to sync the songs they don't appear on my phone. Can anyone give me a solution to this?