Which of these musical forms typically includes overtures?

The correct answer is that oratorios typically include overtures. An overture serves as an introduction to the work, setting the stage for the themes and moods that will be explored throughout the piece. In the context of an oratorio, the overture often incorporates musical themes that are later developed in the vocal and instrumental sections of the work, creating a cohesive experience for the listener.

Understanding the function of an overture is important because it helps to establish the context and emotional landscape of what follows. This feature differentiates it from other forms. While symphonies do have introductions, they are typically not referred to as overtures in the same context as oratorios. Similarly, fugues and sonatas have more complex structures and do not include overtures in their compositions. Thus, oratorios stand out as the form that consistently features overtures as a key component of their structure.