Why will my itunes not sync all of my music to my iPhone 4?

When i look at the number of songs i have on my desktop I have 748 and when i look at my computer it says there are 755 songs in my library. I can't figure out why it says this?

Probably the ones that do not sync are not checked. Make sure there's a check mark next to every song, or in the sync information choose 'Sync Entire Library' or something similar.

I had this problem yesterday as it goes!

You just have to update your itunes software as there's a new one out and it will sync. Do this by clicking the 'help' or 'tool' tab (can't remember which) at the top of itunes, then search for an update link, then instal it

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