CHOPIN (Henri). OU. Cinquième saison. Journal of evolutionary poetry. Sceaux : Henri Chopin ; Ingatestone : The Gate House, [1964-1974]. - 12 issues in-4, folio or paperback, in cover with flap glued to two pieces of wood. Very rare set of almost all the issues published under the title OU, of this avant-garde revue-disque founded and directed by the concrete and sound poet Henri Chopin (1922-2008).{Inspired by Dadaist magazines such as Pierre Albert-Birot's SIC, Chopin launched Cinquième Saison (1958), which became OU from the double issue 20-21, from 1964 to 1974, a pioneering magazine that went beyond the book to explore intermediality. Chopin published poèmes-partitions, dactylopoèmes, and works by artists such as Bernard Heidsieck, François Dufrêne, Jean Berthier, Gianni Bertini, Julien Blaine, Pierre et Ilse Garnier, Claude Pélieu, Gette and Raoul Hausmann, blending concrete poetry, Lettrism and historical avant-gardes. The magazine becomes a space for collective creation, where each issue is a work to be read, listened to, seen and manipulated. Chopin defends a non-verbal poetry, free from the book, and opposes concrete musicians accused of appropriating sound poetry without recognition. OU also innovated with its material layout: sleeves, posters, discs and objects to be unfolded, transforming reading into a sensory experience. The magazine ceased publication in 1974, with issue triple 42-43-44, due to a lack of resources and new creations. Despite this, OU remains a model for later experimental magazines, such as Doc(k)s and Banana Split, which take up its intermedial, collective approach. (Source, Gaëlle Théval, Une revue pour sortir du livre : OU-Cinquième saison, in Revue des revues, 2014, pp. 12-23). The set here includes double issues 20-21, 23-24, 26-27, 28-29, 30-31, 34-35, 36-37, 38-39 and 40-41, triple issue 42-43-44 and single issues 22 and 25. Single issues 32 and 33 are missing. The set is composed as follows: - N° 20-21 (1964): 7 inserts make up this issue. A presentation insert. A second numbered insert signed by Bernard Heidsieck, illustrated with a composition by Françoise Janicot and a photograph by Ian Sommerville. An insert illustrated by Bertini, with texts by Henri Chopin. Subsequent inserts illustrated by Berthier, James-Guitet, Brion Gysin and Dupuy respectively. Finally, there's a vinyl disc with side A: Poème-partition by Bernard Heidsieck and I am, Machine-poem by Brion Gysin, and side B: Pistol-poem, permutations pour voix et coups de pistolet, Machine-poem by Brion Gysin and Vibrespace, Audio-poem by Henri Chopin. One of 449 numbered copies on Offset satiné (no. 253). Some soiling to the cover. A second copy of this issue is enclosed. It bears number 327. Some soiling and flaws to the cover. - N° 22 (1964): includes 6 inserts with text and illustrations by Antonio Berni, John Sharkey, John Furnival, Roberto Altmann, Dom Sylvestre Houédard, Bernard Heidsieck, François Saint-Thibault, Henri Chopin, Jan Burka, Edwin Morgan, Claude Pelieu, Ian Hamilton Finlay and Raoul Hausmann. Cover by Paul-Armand Gette. Soiling and soiling to cover. - N° 23-24 (April 1965): contains a 19 x 19 cm booklet, with texts by Caniaris, Pierre Clerc, Paul de Vree, Guy Foreau, Janicot, Lattanzi and Rotello, and two 50 x 25 cem offprints, the first with a photograph by Man Ray, a photographic history by Jean-Loup Philippe and Bertini and two texts by Rochber Gybduf, the second with a composition and text by Paul-Armand Gette, and a second text by Bernard Heidsieck. Complete with the vynile disc featuring works by François Dufrêne, Rotella, Bernard Heidsieck, Bryon Gysin and Henri Chopin. The cover is by Kosice. Precious copy, one of 10 on Arches (no. 5 signed by Chopin at the justification), enriched with an original lithograph signed by Rotella and a hydrorelief-Carton signed by Kosice. Rabat of the cover detached. Joints two other copies of this number, numbered 81 and 83, among the 470 on Offset Chrono Satiné and couché. The number 83 is enriched with what appears to be a mock-up of the offprint with Man Ray's photo. Rabats detached, a few minor flaws to the covers. - N° 25 (1965): paperback issue, mainly devoted to the poetry sessions of the fourth Paris Biennale. Contributors include François Dufrêne, Ian Hamilton Finlay, Jean-Jacques lévêque, Gabriel Paris, Dora Feilane, Henri Chopin, Serge Béguier, Gianni