The answer is string quartet and double bass, with frequent modulations, wanders trough series of foreign keys.
Explanation:
The serenade is a four movement piece with a string quartet and double bass. It is from the Classical Era and the first movement is in sonata-allegro form. The opening of the first movement of Eine Kleine Nachtmusik begins with a marchlike theme that rapidly ascends to its peak, a rocket theme, them turns downward at the same rate.
The overall form of the third movement of the serenade is ABA, with frequent modulations, wanders trough series of foreign keys.
Urban areas doubled, tripled, or quadrupled in size which led to over crowding in cities. Sometimes a large population is a good thing, but in this case the population was too big and caused many health problems.
