Intensity or Loudness is the quality that
lets you know how SOFT or LOUD the note sounds.
IN PHYSICS it depends on the AMPLITUDE of the vibrations.
Soft sound: small amplitude of vibrations
Loud sound: big amplitude of vibrations
Its
measure is the DECIBEL (dB)
IN MUSIC we need Italian words (piano, forte, crescendo, decrescendo...)
for
DYNAMICS MARKING
With
the combination of different dynamics music is more EXPRESSIVE
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