When a musical idea returns with alterations, it is called variation and theme.
A musical notion can serve as the musical expression of a thought. Not thoughts about music, but rather the innovations of composers that act as the intellectual components of their artwork Some claim that the development of a subject or musical arrangement qualifies as the formation of a musical idea.
A leitmotif is a theme that conceptually relates to a certain subject, object, or idea. Such a motif may occasionally be a musical rendering of the given name. A head-motif is the beginning melodic theme that connects a number of movements.
Thus, it is variation and theme.
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