In the rondo form of the third movement, the A section always returns, though sometimes with a variation.
What kind of movement is a rondo?
The last movement of a symphony, concerto, sonata, or other multi-movement piece is frequently a rondo. Although the structure of a rondo is rather straightforward, composers frequently opt to make complicated modifications to that structure. Each rondo contains a melody that is repeated and is followed by contrasting musical passages.
The A part always reappears, maybe with a variation, in the rondo form of the third movement. A dance-like form, like the Minuet [or Scherzo] and Trio form, is typically used for the third movement.
Therefore, The melodic material that was introduced at the beginning of the song keeps coming back in a piece of music called a rondo.
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