My quick take on sonata is that it is a played piece and a contata is all vocal.
That's why I was saying it's the most nebulous term for a format there is. Sure, I think in modern times, composers will title nearly anything a "sonata". In the times before Haydn/Beethoven, collections of movements were also called sonatas, but they could have easily been called something else, say, a "suite" for example.
I guess I was talking about the
form of a sonata. When we speak of sonata-form, the concept becomes more specific, and invariably the one that came out of the classical period.
Funny you should mention the 5th because I just got that on vinyl today.
I guess having it on CD and DVD-A wasn't enough.
I was hoping that the idea that the typical sonata form, with the idea/description of "dueling themes", would give you a little more insight when listening to classical/romantic works.