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 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.

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.

A Night in a Persian Garden is the name of a Nocturne composed by the Persian (Iranian) contemporary composer Behzad Ranjbaran. This Nocturne, published recently by the Theodore Presser Company in the US, was performed for the first time in 2002 in New York City by the young Persian pianist Soheil Nasseri and has enjoyed many performances by other pianists.

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

Simorgh (Simorq) Orchestra was founded by the renowned Iranian composer, Hamid Motebassem, in 2011. Simorgh Orchestra is the largest orchestra featuring Iranian national instruments. Although the orchestra established by Master Hossein Dehlavi, the great Iranian composer, in 1993 was larger than Simorgh Orchestra, it only featured the Iranian plucked string instruments unlike the latter one. The first album which was recorded by the Orchestra, conducted under Motebassem’s baton, was his Simorq based on Zal story from Shahnameh by Ferdowsi, the great Iranian poet.

Avaye Naerika Percussion Orchestra is an Iranian percussion orchestra featuring 40 lady percussionists. The Orchestra was established as Iran’s largest all-female percussion orchestra in 2008 by Ms. Minoo Rezaei under the title Naerika Percussion Orchestra and changed its name to Avaye Naerika in 2017.

Despite the fact that Iranian folk music (regional music of Iran), like the Radif of Iranian traditional music, is monophonic and follows heterophony in principal, we experience polyphonic forms, albeit, majorly unconscious.

(A review of the “So Faraway” album; Tar and Tonbak duet; Siavash Imani, Pedram Khavarzmini)

Khosrow Djafarzadeh, musicologist and architect, who was also one of the main authors of HarmonyTalk journal passed away on 15 July 2019.