Music in iPhone 4 and iTunes not in sync.  Have 2000 songs on iPhone that iTunes does not know about.

I have an iPhone 4.  I recently moved to a new laptop.  I have about 2000 songs stuck on my iPhone that iTunes does NOT recognize.  I've tried several things.  I've went back and forth between "manually manage music and videos." I've checked/unchecked Sync Music.  I've checked/unchecked playlists, artists, etc.  At this point, iTunes doesn't think I have any music on my iPhone EXCEPT for the Capacity.  The Capacity seems to be right. At this point, without deleting every artist individually and manually, I'd like to delete the 2000 songs and start over.  Any tips?

Updating is not suppose to wipe any media or apps.
It may happen because sometimes things just go wrong.
I would back everything up first.

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