Question

What was the structural basis for the classical symphony?

Answer 1

The sonata form.

In particular, the sonata form typically was the structure of the first movement of classical symphonies.  Sonata form follows this pattern:
Exposition:  Two musical themes are set forth or "exposed" to the listeners.  (Thus the label "exposition.")  The first theme is usually strong, the second quieter, more gentle.
Development:  Then the two themes are explored or "developed" in various ways and played off of one another.
Recapitulation:  Finally, the themes are restated in the order in which they were introduced in the exposition section and reaffirmed as the musical themes of the movement.

Answer 2

Answer:

The structural basis for the classical symphony is discussed below.

Explanation:

• A symphony is a grand range musical activity designed to be performed in the performance arena.
• It is normally in four tendencies. The standard Classical style is 1st movement - (quick) in sonata form.
• The second is more gradual and more poetic; the third is a dynamic time (dance); and the fourth is a carefree finale.