The music of the western european concert tradition is referred to as

This is considered Classical music. This type of music is a more standardized form, which was brought about by the wish to describe the period between Bach and Beethoven. Classical music differs from more "popular" types and other forms by its adherence to more structured practices and regimented, written-down concepts.

I think the correct answer from the choices listed above is the second option. The United States Senate compares to ancient Greece's the Assembly. It is the most fitted choice. Hope this answers the question. Have a nice day.