A section that sounds fairly complete and independent but is part of a larger composition is called a **movement**.
Movements are often found in classical music, such as symphonies, concertos, and sonatas. They can also be found in other types of music, such as jazz and rock. Movements typically have their own tempo, key, and mood, but they are also connected to the other movements in the composition.
For example, a symphony typically has four movements, each with its own unique character. The first movement is often fast and dramatic, the second movement is often slow and lyrical, the third movement is often lively and dance-like, and the fourth movement is often grand and triumphant.
Movements can also be used to tell a story or to convey a particular emotion. For example, the slow movement of Beethoven's Symphony No. 5 is often interpreted as a funeral march, while the finale of Mahler's Symphony No. 2 is often interpreted as a celebration of life.
Movements are an important part of many musical compositions. They allow composers to create complex and nuanced works of art that can tell stories, convey emotions, and evoke a wide range of human experiences.