Birdsong filled the air, a sweet symphony of nature.

Meaning: The birds were singing beautiful songs, creating a harmonious and pleasing sound in the air.

Choice of Words: Birdsong is a noun that refers to the sound of birds singing. Symphony is a noun that refers to a piece of music for an orchestra. Nature is a noun that refers to the natural world. The phrase a sweet symphony of nature is a metaphor, comparing the birdsong to a beautiful piece of music.

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