The first and last movements of the concerto grosso are often in form.?

The first and last movements of a concerto grosso are typically structured in a ritornello form, which features a recurring theme played by the full ensemble (the ripieno) interspersed with contrasting episodes performed by the soloists (the concertino). This structure creates a dynamic interplay between the groups, enhancing the overall texture and drama of the music. Additionally, the use of this form allows for a balance between unity and variation, making it a hallmark of the genre.