Apple has a nice documented Technical Q&A page for implementing scripting targets for Mail.app. However, even though scripting targets also work for iTunes, there isn't a comprehensive list of available scripting targets.
Does anybody know how to find this list? The WWDC 2012 session on Secure Automation mentions a few, but it isn't comprehensive.
In OS X 10.9 Mavericks, you can view the com.apple.iTunes.sdef file at /System/Library/Frameworks/Foundation.framework/Versions/Current/Resources. This lists the scripting target access group associated with each AppleScript command.
There are six access groups:
com.apple.iTunes.device
com.apple.iTunes.library.read
com.apple.iTunes.library.read-write
com.apple.iTunes.playback
com.apple.iTunes.podcast
com.apple.iTunes.user-interface
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