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These signals add value to the lyrics of the song let it go and its meaning because these words seem to have presented the song in a more dramatic, colorful and meaningful way. These signals also add entertainment value of the lyrics like the idioms, it provides a more creative way of presenting  the thought or idea of the song. The song seems more creative, entertaining and colorful thus, it helps in the easy comprehension of its meaning. It also attracts readers or critics of the song making it even popular and improved. 
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