The first time you sit in an ayahuasca ceremony, you expect the brew to do the heavy lifting. Then the shaman starts singing, and something in the room shifts — the visions change direction, your nausea settles or spikes, the air itself feels like it has weight. That's not a coincidence. That's an icaro doing its job.

Icaros are the medicine songs of Amazonian plant medicine traditions, and if you're researching an ayahuasca retreat, understanding them matters more than most first-timers realize. They're not entertainment. They're not even really performance in the way a Western audience thinks of music. They're a working tool — arguably the most important one the curandero has — and the quality of the icaros in a ceremony tells you an enormous amount about the quality of the ceremony itself.

So What Exactly Is an Icaro?

The word comes from the Quechua verb ikaray, which roughly means to blow smoke or breath over something with intention. That gives you a clue. An icaro isn't a song about something — it's a song that does something. The sound, the breath, the melody, and the specific words all carry a function. Shamans describe icaros as learned directly from the plants themselves, usually during long periods of isolated dieta where the curandero drinks a single master plant for weeks or months and listens for what it has to teach.

Different lineages carry different repertoires. A Shipibo maestro from the Ucayali river will sing icaros that sound almost geometric — tight, patterned, almost woven. A mestizo curandero trained in the Pucallpa tradition might sing something looser, more melodic, with Spanish and Quechua phrases bleeding into each other. Neither is more authentic than the other. They're dialects of the same underlying technology.

The songs aren't improvised in the sense a jazz musician would understand improvisation. They're drawn from a memorized body of material, chosen in real time based on what the shaman perceives is happening — in the room, in the brew, in each individual drinker. That last part is important. A good curandero isn't singing to the group. They're reading the ceremony and adjusting song by song.

What Icaros Actually Do During a Ceremony

If you've never sat in ceremony, this is going to sound mystical. If you have, you already know it's just… what happens. Icaros steer the experience. They open the door, they modulate the intensity, and when things get rough, they bring you back.

In practical terms, participants and researchers who've documented ceremonies consistently describe icaros doing a handful of specific things:

• Calling the mareación — the visionary state. Certain songs are used early in the night to invite the medicine to come up. You can often feel the brew intensify the moment the first icaro begins.
• Shaping the visions. Some icaros bring geometric patterns, others bring plant visions, others bring encounters with specific spirits or ancestors. Experienced drinkers can sometimes recognize which song is being sung by what starts appearing behind closed eyes.
• Cleansing or limpieza. When a drinker is purging or stuck in difficulty, the curandero often moves close and sings directly over them. The icaro becomes targeted work, pulling what the shaman perceives as heavy or stuck energy out of the body.
• Closing and sealing. At the end of the night, specific icaros bring everyone down and close the ceremonial space. Skip this step and people stay unmoored for days.

There's also a protective function that doesn't get talked about enough in English-language retreat marketing. In the traditional worldview, an open ceremony is an open channel, and not everything that wants to come through should. Icaros are the fence line. The curandero sings to keep the space clean and to keep participants from getting tangled with things they didn't come to meet.

How Shamans Learn Their Songs

You can't buy an icaro. You can't learn one from a YouTube video, no matter how reverently the uploader presents it. The traditional path is dieta — a long, strict period of isolation during which the apprentice drinks one master plant repeatedly, eats a bland restricted diet (no salt, sugar, oil, pork, alcohol, sex), and essentially waits. The plant, if it decides to teach, gives the song in dreams or in vision.

This is why icaros vary so wildly between curanderos. Each one has walked their own path with specific plants and received specific songs. A shaman who has dieted bobinsana will have different icaros than one who has dieted chiric sanango or ajo sacha. The repertoire is a kind of medical history, written in sound.

Apprenticeship traditionally lasts years, sometimes decades. The maestro teaches structure and lineage; the plants teach the actual songs. This matters for anyone evaluating retreats, because the industry is currently full of facilitators with six months of training who sing memorized icaros without having done the underlying work. The songs are technically correct. The transmission isn't there. Participants often can't articulate the difference, but they feel it.

How to Tell a Working Icaro from a Pretty One

Here's the honest part. Not every icaro you'll hear at a retreat is doing much. Some facilitators sing beautifully but produce no detectable shift in the room. Others — and you'll know them when you encounter them — sing something that sounds plain and almost mumbled, and the entire ceremony pivots on it.

A few things to pay attention to if you're trying to assess a retreat before booking:

1. Where did the facilitators train, and with whom? Ask. Reputable retreats will tell you plainly which lineage their curanderos come from and how long they trained. Vague answers are a flag.
2. Is there a lead curandero present, or just facilitators? Many retreats run ceremonies with Western facilitators and no traditionally trained maestro in the room. The icaros may still be sung, but the depth of the work shifts significantly.
3. Do icaros run continuously, or only intermittently? In a traditional ceremony, there's rarely more than a few minutes of silence. The singing is the structure. Long silences early on can mean the shaman is listening, but hours of silence usually means the ceremony lacks a strong musical anchor.
4. Are participants sung to individually? One-on-one icaros for people in difficulty are a hallmark of attentive ceremonial work.

None of this is a guarantee. Plenty of underqualified people sing a lot, and plenty of masters sing sparingly. But the shape of how music lives in a ceremony tells you something real about how seriously the tradition is being carried.

What This Means If You're Considering a Retreat

Most people researching their first ayahuasca retreat are focused on logistics — where to go, how much it costs, how safe it is, whether their anxiety or depression or addiction has any business being treated this way. All of that matters. But once you're in the maloca, with the brew moving through you and the night ahead, the thing that will carry you is the singing.

Choose with that in mind. A beautiful jungle lodge with Instagram-ready meals and a weakly trained song-leader will be a less safe and less effective experience than a modest center where a real maestro sits at the head of the room. The medicine itself is only half the story. The icaros are the other half — the hands guiding the brew through you, keeping you oriented, calling you back when you drift too far.

If you want to go deeper into this before committing, read interviews with Shipibo maestros, listen to field recordings (plenty exist on Wikipedia and in ethnomusicology archives), and ask any retreat you're considering specific questions about who will be singing and what lineage they come from. When you're ready to look at specific options, a range of vetted ayahuasca retreats with traditionally trained curanderos can be browsed on our marketplace here. Pay attention to the songs. They're not the soundtrack. They're the medicine.