I suggest the following text for the "Icaro" article as a stub.
Icaros are the magical songs (i.e. a musical notation that is verbal and under normal circumstances would be perceived as an auditory sensation) the Ayahuasceros sing to induce pictorial representations, rich tapestries of colors and patterns that are visually seen by the listener. Phenomenologically, this is a form of synaesthesia, a common motif of the ayahuasca experience. The ayahuasca ingredient, harmine, was once known as telepathine because of this group-facilitated activity of singing icaros and the shared perception it cultivates. A shaman who is one of the Ayahuascero people is expected to memorize as many icaros as they can.