Why aren't all my songs syncing onto my iPhone?

I just got my iPhone last week, and after I synced all my songs (590 of them) to my computer, I tried to sync them onto my iPhone. However, only 345 of them are syncing. In iTunes the box next to "Sync Music" and "Entire Music Library" is checked. Down at the bottom the bar that shows how much music, apps, photos, etc.shows that I have 590 songs, but once I click "Apply" it syncs, but the bar reduces to only 345 songs!

My guess is the 590 songs that you synched they are not in Itunes. Try to drag and paste them back into itunes and then resync. Did you delete any of your songs on your computer?

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