Why would iTunes (10.6.3) change my music files?

This isn't the first time I've had this problem. I have 79,042 songs in iTunes library. Every once in a while, I play a track that I've played many times before, only to discover that the music coming from the file is not longer what it was supposed to be. For example, I have a George Harrison album taken from a CD. I listen to it regularly. Minutes ago, I played some of the tracks and found MOST of them had become YES tracks, which are also on my external hard drive (where I keep all of my iTunes). In fact, each time this has occured, the file changes to a YES track ??? When I locate the original George Harrison file on the drive, it still has the title from the George Harrison album, but a quick check shows that the music coming from the file is no longer George, even though the track length is the same, etc. Even the album art is the same.
iMac 10.7.4
iTunes 10.6.3
Could it be related to the external drive?

Limnos, thanks for the reply.
These are movies I've ripped from my DVDs and imported into iTunes to be able to watch them on my TV via AirPlay. They are not purchases from Apple. Since Mountain Lion is supposed to allow using AirPlay from other Apps, I may have to use another App to manage and play movies after the OS upgrade.
On the other hand, if I could get credit for owned DVDs with the iTunes store, without having to rip them myself, AND not have to keep every one of them stored locally, it would be very nice.

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http://riggswerks.com/itunes/diy_gaps.gif
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http://discussions.apple.com/message.jspa?messageID=1308126#1308126
http://discussions.apple.com/message.jspa?messageID=1308121#1308121
http://discussions.apple.com/message.jspa?messageID=1308060#1308060
http://discussions.apple.com/message.jspa?messageID=1307909#1307909
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hiya!
hmmm. okay, here's a user tip on moving your music files to a different drive. can you spot anything you might have missed on the first attempt?
MacMuse: Move iTunes music/Library to new drive
love, b

Why would iTunes (10.6.3) change my music files?

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