As a composer develops a musical idea she may use as a way to shorten the musical motive.

fragmentation

A musical motive is a short musical idea that is consist of just a few notes or maybe a part of a larger theme. Shortening a musical motive is  taking away some notes or  only using a part of it

To shorten the musical motive, the composer uses fragmentation.

Fragmentation

One of the most basic components of music motive development is fragmentation where one part of a motive may be repeated and then variations are introduced into it to distinguish it from the rest of the motive. This technique shortens the length of the motive.

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