What instrumental musical form developed during the Classical period to create audience interest?

The symphony emerged as a prominent instrumental musical form during the Classical period, designed to captivate audiences with its dynamic structure and orchestral depth. Typically consisting of multiple movements, a symphony showcases contrasting themes, varied tempos, and rich instrumentation, allowing composers like Haydn and Mozart to explore emotional breadth and complexity. This form not only highlighted the technical prowess of orchestras but also engaged listeners through its thematic development and innovative orchestration.