Final answer:
A typical middle-class audience for a solo concerto during the classical period would be middle-class professionals who had disposable income and an interest in cultural events as a way to express their social status.
Step-by-step explanation:
The typical middle-class audience for a performance of a solo concerto during the classical period would most likely be described as middle-class professionals. During this era, there was a rise in the middle class, which included professionals such as doctors, lawyers, engineers, and scientists. This new audience had disposable income to spend on cultural events and sought to express their status and educational interests in refined pursuits such as attending classical music concerts. As such, they were different from the wealthy aristocrats, who would be patrons and connoisseurs of the arts, and different from lower-class peasants and the religious clergy who would likely not have the means or social inclination to attend such events.