The personification affects the first stanza's meaning as:
It creates the impression that the world of nature is alive with interactions.
Explanation:
Personification is the figure of speech in which the human characteristics are attributed to any nonhuman things in the human form. In the first stanza, the grasses are personified to be dancing and the wind to play the tunes. The human characteristics of singing and playing tunes are attributed in non-human things.
