In this movement, all the instruments play the role of soloists. We cannot differentiate between soloists (concertino) and orchestra (ripieno) as in a typical baroque concerto grosso.
The first six measures present the thematic material that will serve as the basis for the entire movement. We can consider measures 1 to 13, an exposition or ritornello that will reappear varied throughout the movement in different keys until it is repeated in its original form to conclude the movement.
Between each ritornello or re-exposition, variations of the thematic material of the first measures are developed. We will call these variations episodes. We will visit all the keys close to F major: C major, D minor, B flat major, G minor and A minor.
This is the structure of the first movement of this concerto (click on the sections for a detailed analysis):
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