Which musical device can composers use to lengthen a note by double

The answer is Fermata

Composers use a fermata () to indicate that musicians should hold or sustain a note longer than its intended value. Exactly how long to stretch the note is not defined, but a note marked with a fermata can even double in length.

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donald carl johanson (born june 28, 1943) is an american paleoanthropologist. he is known for discovering – with yves coppens and maurice taieb – the fossil of a female hominin australopithecine known as "lucy" in the afar triangle region of hadar, ethiopia.

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