Wikipedia
Icaro
An icaro is a song sung or whistled in vegetal ceremonies. The word icaro is believed to derive from the Quechua verb ikaray, which means "to blow smoke in order to heal".
They are used to enhance or subdue the effects of plant medicines, to evoke plant spirits, to invite the spirits of others or the deceased, to dispel dark spirits, or to protect those present, and to manage the ceremony. Experienced shamans can recite hundreds of icaros.
Icaros are either whistled or vocalised in words and vocables.
The singing or whistling of icaros is sometimes accompanied by chakapa, a rattle of bundled leaves.