These satellite system(avaz-song or naghmeh),four belonging to the dastgah
of Shur and one to Homayon.Their individual names are: Abu Ata,
Bayat-e Tork,Afshari and Dashti associated with the dasgah of shur; and
Esfahan,associated with Homayon.The music theoristes usually translate
dastgah as "mode".Each dastgah has its own seven-note scale and some
notes have special sinificance within that scale. When a performer is asked
to define a certain dastgah ,he does not play its scale,but its first Gusheh.
newton Music Hall