This article is proposed as an original study on the application of the methods of textual data analysis to musical corpus. In modern musicology, the musical oktoechos of the charagan repertoire of the Armenian liturgical chant has never been described in detail. This repertoire is organized in an oktoechos (eight modes) system. In its present state, some twenty musical modes seem to have been classified by convention in a symbolic system of oktoechos. This fact gives each of the oktoechos modes the character of a mode family rather than a precise single mode. In this article, we are presenting the first stage of the description of six different versions of 42 chants belonging to the same mode and same melody-type. A total of 728 verses, divided into phrase units, are analysed with Sphinx application program. Our analysis with Sphinx allows us to show the specificities of different versions, degrees, as well as proper motifs of initial, median and final formulae of different versions of these songs. The analysis also permits to reveal characteristic formulae suits of sharakan phrases, and the environment created by different intervals which constitute this mode.