How does a concerto grosso typically differ from a concerto?

A concerto grosso is characterized primarily by the presence of multiple solo instruments, which distinguishes it from the more typical solo concerto format. In a concerto grosso, a small group of soloists, known as the concertino, contrasts with the full orchestra, referred to as the ripieno. This interplay between the smaller group and the larger ensemble allows for rich texture and dynamic variation throughout the piece.

The option stating that a concerto grosso features multiple solo instruments accurately captures this essence, emphasizing the collaborative dialogue between the concertino and the orchestra. This structure is designed to create a more complex musical conversation compared to a solo concerto, where a single instrument is showcased against the background of the orchestra.

While the other characteristics mentioned—such as movement structure and orchestral size—can be present in various forms of concertos, they do not define the concerto grosso in the way that the presence of multiple soloists does. Therefore, the focus on multiple solo instruments as a defining feature is what makes the correct answer clear and important in distinguishing these two forms of concertos.