Very little is known about the music under the Siljuks. This was possibly due to the nature of the music itself, which unlike some monuments, metal works and other handcrafts, and also poets’ collections, has gone forever, and also in the Siljuks era (maybe as a result of wars and various displacements), it was not usual to write treatise on music. However, there are some reports and signs of music in the written sources that show Siljuks courts supported some of the prominent musicians. There are also the treatises which have been written on music during this era; for example, Khayyam’s music treatise, Muhammad Nishaburi’s treatise and the Jami’ al-Ulum’s section on music (chapter 48). On the basis of these sources, the music of this age is divided into Bazmi (lyrical) and Razmi (epical). Some musical instruments used in Bazmi music are Rubab, Chaghana, Chang (Lyre), Sinj (cymbal), Tanbur, Ney, Rud, Barbat, Ud (lute), Mizhar and Daf. And the musical instruments played in Razmi music are Tabl (drum), Kus, Burw-i Parang and Nafir that the two last ones are attributed to AlbArsalan. It is supposed that Khurasan’s 12 notes system were received to Byzantine and Baghdad by the extension of dominion of Siljuks from East to West.