A section of Iranian traditional classified music "it is in common in middle east and middle Asia" is a freestyle improvise music which is not predetermined of any meter or rhythm section(but it might be played in different Muqams). in different countries or cultures it has its own different specific names.
In Iran named it "Avazi", Avazi means a free vocal sound which is the result of human or animal's vocalism, and this is a sample of Avazi.
The name of instrument is Kamancheh, 
The Muqams system in Iran has been changed by MirzaAbdolah Farahani around 130 years ago to a new category of Iranian contemporary national music named Muosighi Dastgahi(Dastgahi music), the video here has played improvise is in "Dastgah Shuor", and a smaller subset part of this Dastgah named "Avaz Bayate Zand".
Author and Kamancheh player: majiddoulatshah@Hotmail.com

Majid.Doulatshah,BayatZand.mp3

zohre
زهره یار من داریوش رفیعی 
#زهره #داریوش_رفیعی
伊朗音乐

Majid Doulatshah