Under File > Manage Collections do you see an entry for Music? Configure it (gold feature) and you'll be able to add criteria just like Auto-Playlists.

Sorry, I looked at File/manage Collections and a window appears called Options. I searched all the choices and "Music Collection" is not on the list.
So I see no place to enter Type = Classical Music

This is fully customizable for Gold Users under File > Manage Collections. You can edit the Music Collection to include Type = Classical Music. Free users can enable the Entire Library Collection and use it instead as it always shows all files.

Is there any way to stop MM4 from automatically moving music tracks with a Genre of "Classical" in the tag to the Classical Collection during scans ? I'm finding this new to MM behavior VERY annoying ! I spent many hours trying to find out why 620 of 12660 tracks on my hard drive didn't show up in the database after installing MM4 Gold on a new computer and rescanning my entire music collection. I don't see any good reason for having one specific music genre split out and treated differently from all the other genres.