22.1 GB of Other - what is this?

After recently upgrading to iOS5, I did not get any of my music back on my iPhone 4.  In looking at iTunes I see 22.1GB of other.  What is this and how do I get rid of it?  Before the upgrade I had my entire music library on my 32GB iPhone.  Now it looks like something has consumed all of my free space.  How do I find out what this is and remove it?

Restore your iPhone from backup.

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