EMOTION - (1) Agitation of the passions or sensibilities, (2) A strong, complex feeling, such as joy, sorrow, or hate.

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human emotion contributes to musical unity
human emotion has instance love
human emotion has instance hate
human emotion has instance sorrow
human emotion has instance joy
human emotion has instance hope
human emotion has instance sadness
human emotion is expressed in music
human emotion is expressed in melody
human emotion is expressed in rhythm
human emotion is expressed in timbre