One of the most important theories in linguistic studies is Halliday's theory of "role-oriented textual coherence." Cohesion is a set of relationships between the components of a text that, through lexical and grammatical elements, connects a part of a sentence to previous words, groups, or sentences. Since the factor of "cohesion" creates a connection and internal connection between words and, consequently, creates music in the text, This research, using a descriptive-analytical method, has examined the theory of coherence in two axes: grammatical and lexical. Then, by enumerating the techniques for creating coherence in Sepid Shamloo's poems, it has analyzed and examined the extent of the effect of these techniques in increasing the inner music of his poetry, based on Halliday's theory. This article also attempts to answer the question: "What effect does the element of coherence have in creating the inner music of Shamlou's poetry?" The findings of this research show that coherence is one of the ways to create the inner music of blank poetry, and Shamlou, through his mastery of the Persian language, familiarity with the morphological and syntactic capacities of this language, and benefiting from the elements of lexical coherence, especially the elements of repetition, deletion, and conjunction, has been able to create a desirable connection between words and concepts in his poetry And use methods of creating coherence as part of the ways to create music in blank poetry.