the study on potentials of tone modules combinations and their acoustical consonance in iranian music

one of the fields of creation and practice expansion is an attempt to diversify and multiply melodic modules which can increase practical potentials in a musical system. the most fundamental element of a sonic- musical atmosphere (mode) is ambits of tone; in other words, it is a sequence of tones with specific frequency. therefore, melodic modules combination depends on acoustical features and rules of intervals integration. this article tries to extract the kinds of tone modules and rules of their intervals combinations from its repertory, based on sonic reality of dastgahi music and also study combination potential of these modules according to methods of old musical treatises. in addition, the article introduces all of the octave modules which are made in trichords, tetrachords, and pentachords and evaluates rate of acoustical consonance of modules based on contents of old treatises accordingly. this estimation can indicate that some of these combinations are not only relies on acoustical rules about consonance, but also depends on auditory taste in different musical cultures.