The guest speaker from last night's show seemed to be mostly correct as far as his interpretations of classical music, its theory, and its relation to metal is concerned.
I do have some comments, assuming that the topic creator was the show's host:
If you're the kind of person that learns best in the classroom setting, take an entry level music theory course while you're still in school. As you progress through the semester, I think you'll find that picking up on some of the basic vocabulary and methodology that governs music allows you to analyze (and appreciate) music more effectively.
Unless last night’s show was an aberration, you might want to investigate the causes of the technical difficulties that plagued your program (specifically: the low sound level and a frequently lost feed), as it places far too much demand and discouragement on the part of the listener.