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I thought GarageBand only came on an install DVD?

Well, after looking at those screenshots, you might not want to look on your OS installation disks, but the application CD that came with them.
 
There were no other Application DVD's only the Installation DVD's. There were none with my eMac that came with Panther and there were none with my second eMac that came with Tiger.

I had a look on the Panther DVD's and they also don't have GarageBand on them.

The DVD's that came with Panther are called "Software Install and Restore" and the DVD's that came with Tiger are called "Mac OSX Install"
 
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