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During the Classical era, musical concerts were highly expected events, and because someone who liked a piece of music could not listen to it again, musicians had to think of a way to make the music sink in. Therefore, they would repeat parts of their song at times, making music like sonata very repetitive, without being dull.(Bowen)
Repetition is important in musical form. The repetition of any section of ternary form results in expanded ternary form and in binary form the repetition of the first section at the end of the second results in rounded binary form.(Benward & Saker, 315) Schenker argued that musical technique's, "most striking and distinctive characteristic" is repetition (Kivy, 327) while Boulez argues that a high level of interest in repetition and variation (analogy and difference, recognition and the unknown) is characteristic of all musicians, especially contemporary, and the dialectic [conversation] between the two creates musical form.(Campbell, 154)