On March 1, 2013 in the Glazunov concert hall at the St. Petersburg Conservatory named after N.A. Rimsky-Korsakov,  “Hesar” for Symphony Orchestra will be performed by the Symphony Orchestra of the Opera and Ballet Theatre of the St. Petersburg State Conservatory. “Hesar” was written in February 2013 on the basis of traditional Iranian music system “dastgah.” “Hesar” in Persian means “fortress” and it is one  part of the Iranian dastgah called “Chahargah.”

DASTGĀH, is a  system in Persian music, representing a level of organization at which a certain number of melodic types (gūšas) are regrouped and ordered in relation to a dominant mode (māya). Each dastgāh takes its name from this dominant mode, which is always played in the introductory parts. For example,dastgāh-e Čahārgāh comprises not only several gūšas belonging to the mode Čahārgāh but also gūšas in modes that are both closely (Zābol, Ḥeṣār) and distantly (Moḵālef) related, which are played before the conclusion (forūd) in the initial mode. The term dastgāh is thus somewhat ambiguous: “The expression dastgâh-e chahârgâh . . .  Theoretically Čahārgāh can be correctly labeled a dastgāh only to the extent that it is composite, that is, comprises a minimal number of varying modal elements; without these elements it must be considered either a maqām (as Ḵāleqī suggested, pp. 127-28) or a simple mode (māya).