When we hear a piece of music that is not well-structured, it can be confusing and difficult to follow. This is because our brains are not able to make sense of it. As a result, we may lose interest in the music and stop listening.
Structure can also help to create tension and release in music. When a piece of music is well-structured, the tension will build and then be released at the appropriate times. This can be very exciting and engaging for the listener.
In addition to helping our minds to develop expectations, structure can also help to create a sense of unity in a piece of music. When a piece of music is well-structured, the different parts will fit together well and the music will flow smoothly. This can create a very satisfying experience for the listener.