During which musical period were larger orchestrations and less improvisation typical?

The Classical period, which spans roughly from 1750 to 1820, is characterized by the development of larger orchestras and a more structured approach to composition compared to earlier periods. This era saw the emergence of symphonic form and an emphasis on clarity, balance, and transparency within the music. Composers began to move away from the heavy ornamentation and improvisational style that were prevalent in the Baroque era.

Orchestration during the Classical period became more sizable and standardized, with a greater variety of instruments used in harmony and more distinct roles for each section of the orchestra. The focus shifted towards developing musical themes and creating formal structures such as sonata-allegro form, which required a more written and planned approach rather than spontaneous improvisation. Therefore, the larger orchestrations and diminished reliance on improvisation are defining characteristics of the Classical period, making it the correct answer.