In heterophonic variant, two performers perform a single melody simultaneously and change it. Performing and changing a single melody simultaneously by two performers leads to the coincidence of different voices.

ehrouz Mohammadi, “Daf and its feasts in Ghaderieh’s Tekyeh” mentions that the outer thickness of arch where studs are located, [is] between one to one and a half centimeters (Mohammadi, 2001: 12). The thickness of arch should be gradually reduced from the installation place of rings to skin (Avazeh of Daf) to create a high volume, clear sound from Daf; also, the connection of arch to skin should not be less than one millimeter, because in this case the skin will be torn due to the sharpness of the wood (Mogharab Samadi, 2009: 79-78). The thickness of wood on the skin side is about two to three millimeters (Tohidi, 2002: 79).

4.3.1. To practice playing of doubles of notes involving two different fingers, each note is played at separate bows with slow tempo, each note is played perfectly regarding its bass and tenor sounds and then the considered double is played at another bow while considering the resulted sound of the double.

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 this description, we have automatically included a criterion called “History”, Until we know the time of the creation of a work of art, we cannot judge whether it has been easy to create or not. Suppose that, in a historical study, we find a musical work that is similar in compositional techniques (including form, melody, context, and orchestration) to a minor work of the nineteenth century; however, our research proves that, this work dates back to 200 years prior to that date. Can we still consider this work insignificant? Definitely not! So this is where the first use of history-based judgment comes into play.

Wolfgang Amadeus Mozart, the renowned Austrian composer, is undoubtedly one of the greatest geniuses in the history of classical music. However, his life is surrounded by numerous myths and legends, some of which are not based on facts. This article explores five of the most common misconceptions about Mozart’s life.

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.

Mohsen Renani in the preface of his book entitled “The Political Economy of nuclear conflict; an introduction to traversing the civilizations” writes:

Hossein Aslani, Iranian pianist residing in the US, passed away due to cancer in late January 2020. His last musical activity was an article written for Harmony Talk entitled “Iran amidst musical struggle” in 2016, his memoir entitled “I Play You Again” in the same year and his album “Symbolic Emotion” published by Arganoun Publications in 2014. Here is a brief biography of Hossein Aslani according to his own website:

Golnoush Khaleghi, first Persian woman conductor and daughter of legendary composer Rouhollah Khaleghi, passed away on February 14. She was 80. Golnoush Khaleghi was the conductor of the NIRT (National Iranian Radio & Television) Choir in the 1970s. Shortly after the 1979 Islamic Revolution Ms. Khaleghi moved to the United States and founded the Rouhollah…
Read More »