The present series of training articles, “Principles of Violin Playing”, seek to help students, to appropriately understand this field, by gradually introducing, categorizing, and teaching the myriad relevant points. One of the principles of playing violin, which must be always kept in mind, is that the selection of the most natural position for the body parts while playing is the best and most appropriate solution. As a matter of fact, any unnatural body part position which requires lots of energy or unusual stretching to maintain, is wrong.

The term “School of Vaziri” is often used in writings on Iranian music, but the exact meaning of the term is not clear; some of the authors have used the term to only refer to the group of Vaziri’s students, including a large group of his conservatory students and his Tar students such as Abolhassan Saba, Rouhollah Khaleghi, Ahmad Foroutan Rad, Hossein Sanjari, Heshmat Sanjari and others. But can we consider all Vaziri’s students as followers of his school of thought? This is definitely a mistake, because we know that some of Vaziri’s students have chosen a completely different path than that of Vaziri.

Two choirs alternatively perform Veŝ Tavaré Na avaz (Transcription 5). The second group starts the avaz before the first group finishes it; consequently, two different voices coincide (Transcription 5, staves 2 and 5).

In addition to the above-mentioned, polyphony can be also formed when a melody is performed by several singers in different ambiances or different sound registers according to their physiologic abilities. An example of this has been performed in rituals of Khanqah of Ghaderi darawish of Mahabad[i].

Mr. Mohsen Ghanebasiri, author and critic in the field of economy, culture and arts, as the next speaker, highlighted the role of arts, specially the music, in development of societies: “As far as the individual upbringing is concerned, a newborn baby is absolutely dependent. The relation between the baby and the parents is based on orders. There is lots of relativity in these orders; therefore, they are political orders. In the economy, however, the relations are mutual and based on common logic; hence, the formation of the concepts of democracy and individuality.

Conclusion

“Daf” is one of type of percussion instruments that has a long history and is commonly known as circular instruments (with a rim). In some tribes, Daf was used as the main instrument in festivity and joy ceremonies; in another tribe it was used as the main instrument for war and campaign ceremonies and some others used it for ritual and religious ceremonies.

With regard to each polyphonic form, only one specific and distinguished example is analyzed. These polyphonic forms are as follows:

The National Instruments Orchestra of Iran performed its first concert amid much hope and anxiety on July 18, 2015. The Orchestra is founded by Roudaki Cultural and Arts Foundation which is a semi-private foundation in Iran. The Arts Director for the National Instruments Orchestra of Iran is cand the Orchestra Executive Director is Sadjad Pourghand.

In this project, my specialized responsibility  was the basic drawings of the desired instrument with the help of engineering and mechanical software.  I have also the carried out phases related to engineering designs, related variables, and volume and weight calculations under Mr. Ziaei’s direct supervision from the very beginning. Regarding the challenges of this work, suffice it to say that the set of designs for the instrument lasted more than 9 months in the final stage of the project only.

The 4th Iranian Festival of Music Websites and Weblogs was held in Niavaran Cultural Center, in Tehran, Iran on Feb. 28th, 2015. The initiator of the festival was Sajjad Pourghanad, Iranian music writer, researcher, founder of the festival and Persian setar and tar player.