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This article explores the limits between music and poetry. It has often been argued that music and poetry entertain no more than analogical relations. From Mallarmé to Cage, the boundaries between the two arts have considerably melted. In the 1960s and 1970s John Cage managed to open them up in his musical and textual hybridizations. For instance, his Song Books (1970) “textualize” music as well as they “musicalize” texts. His scores are thus poems in their own right and his poetic performances ( Mureau, Empty Words, Roaratorio...) are also to be heard as music.