In indinegous traditions were dmt containing plants are used, especially ayahuasca, singing or simply making sound is THE device to navigate and controll the experience. Songs/Icaros/Hinarios are "received" or tought by spirits to the traveler, so that he can call them. All groups of Ayahuasqeiros have their own songs to call different types of spirits, to put the experience into some directions or even to provoke the "dmt" effect at all. Mostly the singing is supported by instruments (most popular the "maraca" ) drums, guitars, etc.. Sound itself is a mystery, McKenna also talks alot about the possibilities that "making sound" delivers to the ritual use of dmt. Man i can`t tell you, but for what i have experienced in Brazil, singing on Ayahuasca, and controlling the experience of the whole group, just thru singing, NO WORDS. I advice you, write down the songs you are receiving, learn them & use them, it`s not just a song, there are things behind the words that you are using. There are even songs to invoke the DMT effect! A typical Ayahuasca Group don`t consider DMT as the driving force that is responsible for the effect, it`s the song that the Shaman is singing or the spirits which he is calling for, the dmt it self makes you just more sensitive it`s opening the door, but to let beeings thru the door or to push you more controlled thru the door, YOU HAVE TO SING. Sure you will enter the dmt realms without singing, but unless you don`t sing you`re missing some opportunitys! I know it`s hard to unerstand these things from a rational point of view, but i have have seen this; drinking Ayahuasca and feeling nothing, then when the "Master" starts to sing, you think you are blown away, visions come up, and man, there are no words. Clearly it is matter of set & setting, the sounds can provoke some mental/spiritual set.
