Dennis,
I know your question was ostensibly about stacks, but at the core of it was how to best deal with the multi-movement compositions of classical music. A stack is not the best way, I don't think.
MC does not have good built in support for classical music in this regard. But there are a couple of things you can do.
One is to use linked tracks. This suffices for ensuring all movements of a work play together but that's about it.
The other is to extend MC for classical music by creating a user-defined Composition field. The Composition then becomes the object by which you can view and play classical music. This works well, with certain limitations.
I have previously provided information on this approach, so I'd suggest you take a look. You can find some helpful info here:
https://yabb.jriver.com/interact/index.php?topic=122114.0https://yabb.jriver.com/interact/index.php/topic,125382.0.htmlI've suggested in the past that MC be enhanced with built in support for classical compositions, but that was not happened. Hopefully some day.
Good luck...