Unlike the other movements in the symphony, the movement is generally not in the tonic key.

Unlike the other movements in the symphony, the second movement is generally not in the tonic key.

Explanation:

Classicism in music was most evident in the elaboration of different musical forms and their homophonic texture. During the 18th Century, Sonatas, with their structure divided into sections, were predominant. Their texture was usually homophonic, consisting of a single melodic line and less melodic lines accompanying it. The second movement was in a different key from the tonic and light sonorities predominated.  

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