Articles from of the different periods.

When " Kara-Sal Ak-ool" is played "Uzun-Hoyug" on igil, in imagination there is an image of Tuva in all beauty of its steppe open spaces, grandeur of a mighty taiga plentiful every possible riches, the cleanest blueness of the rivers and lakes, shrill blue of the sky above a head and the generous sun rising above Sayan mountains. The thinnest figurativeness - is the characteristic of Tuvan instrumental play on Igil in which with special force  the theme of indissoluble communication of the person with the Nature sounds.
About the impression rendered by traditional instrumental music, people of the senior generation recollect also, especially playing on igil. About one blind igils player Kochuga Oyun, living in Tes-Khem, we find memoirs of family Irisinmaa and Soyan in the newspaper "The Center of Asia" with a subtitle " On igil played so, that people cried ". 
He in accuracy reproduced all sounds of the nature - howl of a wind, groan of a storm, murmur of the river, voices of birds, animals, neigh of horses. Sometimes the melody was such sad, that people cried.
From memoirs known throat-singer and the builder of musical instruments Marjimal Ondar: when some hunters came back from a taiga after hunting, at Mongush Bavuu so the tooth has ached, that he could not sleep almost three nights. On road hunters called on in yurta of old man Shojushkak Ondar. Bavuu from a toothache could not even drink tea. Old man Shojushkak promised: I to you shall play on igil then the pain and you will cease, at last can have a sleep. While the mistress cooked soup, the old man has taken in hands igil, pitch of a larch has wiped a bow and started to play. 
First he played, imitating singing of a cuckoo, a roar of the bull, neigh of horses, then started to play "uzun-hoyug" - lingering, gentle, warm melodies. Bavuu so has listened with delight, that has overlooked about a toothache and it is imperceptible for itself has fallen asleep and has woken up only the next morning. He slept so, that him could not wake in the evening that he soup has had a meal.
What my friend, has fallen asleep not having listened to the end igil? - laughing, the old man asked. That so played on igil I more never heard - told itself Bavuu to Marjimal Mongush.
In musical setup of the tuvan instruments vibrations of thin and thinnest levels of sound space - an ether cooperate. Therefore their medical effect causing tears of clarification is really possible.
In fact igil, byzaanchi, khomus, shoor, sygyt, khoomei, kargyraa function in one system of coordinates, an external attribute of unity which the structure of the sound organization acts burdon-overtone.