The technique of having the same theme fragment reappear with some sort of variation at loosely recurring intervals is:

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Thematic transformation refers to the technique where a theme or motif is varied and transformed throughout a composition. This technique entails the recurrence of a musical idea or theme at different parts of the composition, being subjected to various transformations such as inversion, augmentation, diminution, etc. The variations create new, transformed melodies while retaining some connection to the original theme.

The Technique of Having the Same Theme Fragment Reappear with Some