Shushtar (Persian: شوشتر; Azerbaijani: Şüştər) is a musical modal system in traditional mugham music.
This is the fourth and the smallest mode according to its amount of sounds.
Sound line is created in amalgamation of two tetra-chords with different method.
It creates deeply sad feelings for the listener.
Other mugams relating to the Mugham are: Ovshary, Heydari.