In this study, a system for Iranian traditional music Dastgah classification is presented. Persian music is based upon a set of seven major Dastgahs. The Dastgah in Persian music is similar to western musical scales and also Maqams in Turkish and Arabic music. Fuzzy logic type 2 as the basic part of our system has been used for modeling the uncertainty of tuning the scale steps of each Dastgah. The method assumes each performed note as a Fuzzy Set (FS), so each musical piece is a set of FSs. The maximum similarity between this set and theoretical data indicates the desirable Dastgah. In this study, a collection of small-sized dataset for Persian music is also given. The results indicate that the system works accurately on the dataset.