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Eliott Carter was an American composer, whose personal harmonic and rhythmic language led to the invention of the term metric modulation. The latter describes frequent, precise tempo changes. In David Schiff's book "The Music of Elliott Carter", it is written that Elliott Carter preferred to call it tempo modulation.
Answer:
Secondary source.
Explanation:
The image is not the direct product of a historical event; it was created afterwards using an analysis of primary sources.
