The Cantos is a long modernist poem by Ezra Pound, written in 109 canonical sections in addition to a number of drafts and fragments added as a supplement at the request of the poem's American publisher, James Laughlin. Most of it was written between 1915 and 1962, although much of the material in the first three cantos was abandoned or redistributed in 1923, when Pound prepared the first instalment of the poem, A Draft of XVI Cantos (Three Mountains Press, 1925). It is a book-length work, widely considered to present formidable difficulties to the reader. Strong claims have been made for it as the most significant work of modernist poetry of the twentieth century. As in Pound's prose writing, the themes of economics, governance and culture are integral to its content.

The most striking feature of the text, to a casual browser, is the inclusion of Chinese characters as well as quotations in European languages other than English. Recourse to scholarly commentaries is almost inevitable for a close reader. The range of allusion to historical events is very broad, and abrupt changes occur with little transition. There is also wide geographical reference; Pound added to his earlier interests in the classical Mediterranean culture and East Asia, selective topics from medieval and early modern Italy and Provence, the beginnings of the United States, England of the seventeenth century, and details from Africa he had obtained from Leo Frobenius.

Structure The Cantos can appear on first reading to be chaotic or structureless because the poem lacks an obvious plot. R. P. Blackmur, an early critic, wrote, "The work of Ezra Pound has been for most people almost as difficult to understand as Soviet Russia … The Cantos are not complex, they are complicated".Blackmur 1934 Masks of Ezra Pound Pound and T. S. Eliot had previously approached the subject of fragmentation of human experience: while Eliot was writing, and Pound editing, The Waste Land, Pound had said that he looked upon experience as similar to a series of iron filings on a mirror.Schneidau, Herbert N. "Vorticism and the Career of Ezra Pound". Modern Philology, Volume 65, No. 3, February 1968. 214–227. Each filing is disconnected, but they are drawn into the shape of a rose by the presence of a magnet.

Nevertheless, there are indications in Pound's other writings that there may have been some formal plan underlying the work. In his 1918 essay A Retrospect, Pound wrote "I think there is a 'fluid' as well as a 'solid' content, that some poems may have form as a tree has form, some as water poured into a vase. That most symmetrical forms have certain uses. That a vast number of subjects cannot be precisely, and therefore not properly rendered in symmetrical forms". Critics like Hugh Kenner who take a more positive view of The Cantos have tended to follow this hint, seeing the poem as a poetic record of Pound's life and reading that sends out new branches as new needs arise with the final poem, like a tree, displaying a kind of unpredictable inevitability.

Another approach to the structure of the work is based on a letter Pound wrote to his father in the 1920s, in which he stated that his plan was: A. A. Live man goes down into world of dead. C. B. 'The repeat in history.' B. C. The 'magic moment' or moment of metamorphosis, bust through from quotidian into 'divine or permanent world.' Gods, etc. [The letters ABC/ACB indicate the sequences in which the concepts could be presented.] In the light of cantos written later than this letter, it would be possible to add other recurring motifs to this list, such as: periploi ('voyages around'); vegetation rituals such as the Eleusinian Mysteries; usura, banking and credit; and the drive towards clarity in art, such as the 'clear line' of Renaissance painting and the 'clear song' of the troubadours.

The poem's symbolic structure also makes use of an opposition between darkness and light. Images of light are used variously, and may represent neoplatonic ideas of divinity, the artistic impulse, love (both sacred and physical) and good governance, among other things. The moon is frequently associated in the poem with creativity, while the sun is more often found in relation to the sphere of political and social activity, although there is frequent overlap between the two. From the Rock Drill sequence on, the poem's effort is to merge these two aspects of light into a unified whole.

The Cantos was initially published in the form of separate sections, each containing several cantos that were numbered sequentially using Roman numerals (except cantos 85–109, first published with Arabic numerals). The original publication dates for the groups of cantos are as given below. The complete collection of cantos was published together in 1987 (including a final short coda or fragment, dated 24 August 1966). In 2002 a bilingual edition of "Posthumous Cantos" (Canti postumi) appeared in Italy. This is a concise selection from the mass of drafts (circa 1915–1965) uncollected or unpublished by Pound, and contains many passages that throw light on The Cantos.Patrick McGuinness, "Ezra Pound: Posthumous Cantos edited by Massimo Bacigalupo review – fresh insights into an epic masterpiece". Accessed 24 March 2016.

I–XVI Published in 1925 as A Draft of XVI Cantos by the Three Mountains Press in Paris.

Pound was discussing the possibility of writing a long poem since around 1905, but work did not begin until sometime in 1915. The initial versions of the first three cantos of the proposed "poem of some length" were published in the journal Poetry. In this version, the poem began very much as a direct address by the poet, not to the reader but to the ghost of Robert Browning. Pound came to realise that this need to be a controlling narrative voice was working against the revolutionary intent of his own poetic position, and these first three ur-cantos were soon abandoned and a new starting point sought. The answer was a Latin version of Homer's Odyssey by the Renaissance scholar Andreas Divus that Pound had bought in Paris sometime between 1906 and 1910. Using the metre and syntax of his 1911 version of the Anglo-Saxon poem The Seafarer, Pound made an English version of Divus' rendering of the nekuia episode in which Odysseus and his companions sail to Hades to find out what their future holds. In using this passage to open the poem, Pound introduces a major theme; the excavating of the "dead" past to illuminate both present and future. He also echoes Dante's opening to The Divine Comedy in which the poet also descends into hell to interrogate the dead. The canto concludes with some fragments from the Second Homeric Hymn to Aphrodite, in a Latin version by Georgius Dartona which Pound found in the Divus volume, followed by "So that:"—an invitation to read on.

Canto II opens with some lines rescued from the ur-cantos in which Pound reflects on the indeterminacy of identity by setting side by side four different versions of the troubadour poet Sordello:Liebregts, 97. Browning's poem of that name, the actual Sordello of flesh and blood, Pound's own version of the poet and the Sordello of the brief life appended to manuscripts of his poems. These lines are followed by a sequence of identity shifts involving a seal, the daughter of Lir and other figures associated with the sea: Eleanor of Aquitaine who, through a pair of Homeric epithets that echo her name, shifts into Helen of Troy, Homer with his ear for the "sea surge", the old men of Troy who want to send Helen back over the sea, and an extended, imagistic retelling of the story of the abduction of Dionysus by sailors and his transformation of his abductors into dolphins. Although this last story is found in the Homeric Hymn to Dionysus, also contained in the Divus volume, Pound draws on the version in Ovid's poem Metamorphoses, thus introducing the world of ancient Rome into the poem.

The next five cantos (III–VII), again drawing heavily on Pound's Imagist past for their technique, are essentially based in the Mediterranean, drawing on classical mythology, Renaissance history, the world of the troubadours, Sappho's poetry, a scene from the legend of El Cid that introduces the theme of banking and credit, and Pound's own visits to Venice to create a textual collage saturated with neoplatonist images of clarity and light.

Cantos VIII–XI draw on the story of Sigismondo Pandolfo Malatesta, 15th-century poet, condottiero, lord of Rimini and patron of the arts. Quoting extensively from primary sources, including Malatesta's letters, Pound especially focuses on the building of the church of San Francesco, also known as the Tempio Malatestiano. Designed by Leon Battista Alberti and decorated by artists including Piero della Francesca and Agostino di Duccio, this was a landmark Renaissance building, being the first church to use the Roman triumphal arch as part of its structure. For Pound, who spent a good deal of time seeking patrons for himself, James Joyce, Eliot and a string of little magazines and small presses, the role of the patron was a crucial cultural question, and Malatesta is the first in a line of ruler-patrons to appear in The Cantos.

Canto XII consists of three moral tales on the subject of profit.Hartnett, Stephen. "The Ideologies and Semiotics of Fascism: Analyzing Pound's Cantos 12–15". boundary 2, Volume 20, No. 1, Spring, 1993. 65–93. The first and third of these treat of the creation of profit ex nihilo by exploiting the money supply, comparing this activity with "unnatural" fertility. The central parable contrasts this with wealth-creation based on the creation of useful goods. Canto XIII then introduces Confucius, or Kung, who is presented as the embodiment of the ideal of social order based on ethics.

This section of The Cantos concludes with a vision of hell. Cantos XIV and XV use the convention of the Divine Comedy to present Pound/Dante moving through a hell populated by bankers, newspaper editors, hack writers and other 'perverters of language' and the social order. In Canto XV, Plotinus takes the role of guide played by Virgil in Dante's poem. In Canto XVI, Pound emerges from Hell and into an earthly paradise where he sees some of the personages encountered in earlier cantos. The poem then moves to recollections of World War I, and of Pound's writer and artist friends who fought in it. These include Richard Aldington, Henri Gaudier-Brzeska, Wyndham Lewis, Ernest Hemingway and Fernand Léger, whose war memories the poem includes a passage from (in French). Finally, there is a transcript of Lincoln Steffens' account of the Russian Revolution. These two events, the war and revolution, mark a decisive break with the historic past, including the early modernist period when these writers and artists formed a more-or-less coherent movement.

XVII–XXX XVII–XXVII was published by John Rodker in London in 1928 in a luxury edition called A Draft of the Cantos 17–27 of Ezra Pound: With Initials by Gladys Hynes. Pound then wrote three more cantos for Cantos I–XXX published in 1930 in A Draft of XXX Cantos by Nancy Cunard's Hours Press.

Originally, Pound conceived of Cantos XVII–XXVII as a group that would follow the first volume by starting with the Renaissance and ending with the Russian Revolution. The major locus of these cantos is the city of Venice.

Canto XVII opens with the words "So that", echoing the end of Canto I, and then moves on to another Dionysus-related metamorphosis story. The rest of the canto is concerned with Venice, which is portrayed as a stone forest growing out of the water. Cantos XVIII and XIX return to the theme of financial exploitation, beginning with the Venetian explorer Marco Polo's account of Kublai Khan's paper money. Canto XIX deals mainly with those who profit from war, returning briefly to the Russian Revolution, and ends on the evil of wars and those who promote them.