The text you are reading is about Hamed Fathi, a guitarist and one of Lilly Afshar’s students, which was previously published on the Persian website HarmonyTalk.com:

Bahman Rajabi, the renowned tonbak (Persian goblet drum) player and educator, passed away at his home at the age of 86 due to a heart condition. He was the founder of a distinctive school of tonbak playing, and his teaching methods have been widely used by instructors of the instrument for decades..

Santour:
Nine-bridge and twelve-bridge Sanours were both used until the early Pahlavi dynasty. However, as Faramarz Payvar devised new methods for playing the nine-bridge Sanour, this variety of the instrument which was hammered by felted sticks became popular.

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

The Motherland Orchestra staged the first concert since the outbreak of the pandemic under the baton of Nezhat Amiri. The orchestra went on stage on December 23-24, 2021 in memory of Rouhollah Khaleghi and Golnoush Khaleghi at Vahdat Hall, Tehran, Iran. Since the pandemic outbreak, concerts were held online and restrictions were imposed on in-person concerts.

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.

Today, percussion instruments have such a high place in music that are an essential element of orchestras. This has attracted many people to this type of instrument with roots as old as the first humans. A historical study of music, shows that humans used the sound of these instruments to defend themselves against wild animals and, over time, for alerting each other, signaling their readiness and encouraging people for war, ritual ceremonies, dances, etc. in a manner that is still clearly visible in music and some ritual ceremonies.

This year marks the fifth anniversary of the passing of Khosrow Jafarzadeh (Khosrow Djafar-Zadeh), a distinguished architect and pioneering researcher of Iranian music, whose contributions to the magazine “Harmony Talk” have left an indelible mark on the field. The absence of this remarkable individual has significantly impacted the expansion and advancement of his theories, which are heralded as some of the most progressive in the history of Iranian music

Creating sound continuity between two notes in the source and destination positions when left hand position changes and “two different finger numbers” are involved is called portamento. Portamento can be performed on single string or two neighboring strings and with hand moving on fingerboard either upward or downward.

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.