In the second (1856) edition, Whitman used the title "Poem of Walt Whitman, an American," which was shortened to "Walt Whitman" for the third (1860) edition.
The poem was divided into fifty-two numbered sections for the fourth (1867) edition and finally took on the title "Song of Myself" in the last edition (1891-2). The number of sections is generally thought to mirror the number of weeks in the year.
Following its 1855 publication, "Song of Myself" was immediately singled out by critics and readers for particular attention, and the work remains among the most acclaimed and influential in American poetry.
In 1855, the Christian Spiritualist gave a long, glowing review of "Song of Myself", praising Whitman for representing "a new poetic mediumship," which through active imagination sensed the "influx of spirit and the divine breath."Ralph Waldo Emerson also wrote a letter to Whitman, praising his work for its "wit and wisdom".
Public acceptance was slow in coming, however. Social conservatives denounced the poem as flouting accepted norms of morality due to its blatant depictions of human sexuality. In 1882, Boston's district attorney threatened action against Leaves of Grass for violating the state's obscenity laws and demanded that changes be made to several passages from "Song of Myself".
The poem is written in Whitman's signature free verse style. Whitman, who praises words "as simple as grass" (section 39) forgoes standard verse and stanza patterns in favor of a simple, legible style that can appeal to a mass audience.
Critics have noted a strong Transcendentalist influence on the poem. In section 32, for instance, Whitman expresses a desire to "live amongst the animals" and to find divinity in the insects.
In addition to this romanticism, the poem seems to anticipate a kind of realism that would only become important in United States literature after the American Civil War. In the following 1855 passage, for example, we can see Whitman's inclusion of the gritty details of everyday life:
The lunatic is carried at last to the asylum a confirm'd case,
(He will never sleep any more as he did in the cot in his mother's bed-room;)
The jour printer with gray head and gaunt jaws works at his case,
He turns his quid of tobacco while his eyes blurr with the manuscript;
The malform'd limbs are tied to the surgeon's table,
What is removed drops horribly in a pail;
The quadroon girl is sold at the auction-stand, the drunkard nods by the bar-room stove, ... (section 15)
In the poem, Whitman emphasizes an all-powerful "I" which serves as narrator, who should not be limited to or confused with the person of the historical Walt Whitman. The persona described has transcended the conventional boundaries of self: "I pass death with the dying, and birth with the new-washed babe .... and am not contained between my hat and boots" (section 7).
There are several other quotes from the poem that makes it apparent that Whitman does not consider the narrator to represent a single individual. Rather, he seems to be narrating for all:
Alice L. Cook and John B. Mason offer representative interpretations of the "self" as well as its importance in the poem. Cook writes that the key to understanding the poem lies in the "concept of self" (typified by Whitman) as "both individual and universal," while Mason discusses "the reader's involvement in the poet's movement from the singular to the cosmic". The "self" serves as a human ideal; in contrast to the archetypal self in epic poetry, this self is one of the common people rather than a hero. Nevertheless, Whitman locates heroism in every individual as an expression of the whole (the "leaf" among the "grass").
Canadian doctor and long-time Whitman friend Richard Maurice Bucke analyzed the poem in his influential and widely read 1898 book Cosmic Consciousness, as part of his investigation of the development of man's mystic relation to the infinite.
"Song of Myself" and other Whitman poems are frequently referenced in the 2013 young adult fiction novel Dr. Bird's Advice for Sad Poets by Evan Roskos.