What does this poem signify ?

This poem signifies the heart of america. though the “carols” whitman hears, he notices the people in the background that make america what it is. the laborers, the people who work hard to do a job people don’t think much about; but without them, america would not be what it is now. whitman is also saying how each and every person is connected, related through song, because no matter what you do or where you come from, song is universal. they are all singing to show that they are different, but unified. they are brought together by song. and with all these songs, comes the song of america. when whitman says “each singing what belongs to him or her and no one else,”' he means that every person is living their own life. every life converges to make the “varied carols” he hears when “america is singing.”

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It's a, if this is wrong, i'm so sorry, i'm just trying to