Here you can enjoy them in action:

http://www.youtube.com/watch?v=zZAQe8jKhwg

Rastak a new ensemble for contemporary Persian folk music was formed as an experimental music group in 1997. The group seeks to collect, record and interpret traditional Persian folk music for a global audience, incorporating language, culture and history also merging traditional instruments and forms with contemporary rhythms. The musicians who comprise Rastak have graduated from the best universities in Iran and have done extensive research into Persian folk music.

History
It all began when Siamak and Behzad became friends on a winter’s day in 1994. Three years later, Siamak and Behzad were discussing the idea of forming an ensemble for folk music based on research, collection and interpretation. In 1997 Rastak Music Group was founded in Tehran. …
2002 marks Rastak’s meeting with renowned musicians in folk music from all around Iran such as: Khalifeh Aghe Ghosi from Kurdistan, Noor Mohammad…