They are the symbols in written or printed music that show the singer or instrumental player when to sing or play very very soft, very soft, soft, loud, very loud, very very loud, growing softer, or growing louder.
Dynamic signs in music indicate the volume levels a musician should play, including soft (piano) and loud (forte). They also include terms for gradual changes in volume like crescendo and decrescendo. These signs enhance a musician's ability to convey the emotions in a piece of music.
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