Music The Classical Era
posted by Marie on .
The______ is an essential characteristic of the sonata form.
As with all Wikipedia search results, be sure to check out all the external links and further references at the bottom of each Wikipedia page.
There are about a hundred terms that can fit here. I am not certain any of them are "essential", but some would argue that. If I had to pick one term, it would be "musical theme". I doubt if that is what your teacher wants.