Why does my iPod need to re-synchronize so many files every time

I just plugged in my iPod and it synchronized 12 files, including files that I know for a fact were on the iPod already. Not 30 minutes later I plugged it in and it synchronized 13 files, including some of the same files it had just synchronized.
I've seen this behavior before. What's going on?

Each music file contains a great deal of information regarding the song. If any of this changes, from album artwork to composer, even to play count or skip count, iTunes exchanges that information with the iPod upon sync.
Did you listen to any of these songs in the interim? Did you move them around on the playlists or alter any information? It's not really a significant issue, just the manner by which your iPod stays up-to-date with your iTunes library.

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