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Welcome to Solfeggio Frequencies News. This is the orientation — what this newsletter is, who I am, how I got into all of this, and where to go next depending on what you’re curious about.
Who this is for
If you’ve ever:
Searched for “528 Hz healing music” or “432 Hz meditation” on YouTube and wondered if it actually does anything
Felt like certain music genuinely calms you down or sharpens your focus, but couldn’t explain why
Heard about solfeggio frequencies and wanted to take them seriously without buying into miracle claims
Wished you could listen to your own music — the songs you already love — in a different tuning, without rebuying or re-downloading anything
…then you’re in the right place.
If you’re looking for someone to tell you that 528 Hz cures cancer or that A=440 was a CIA plot, you’re going to be disappointed. I think the actual story is more interesting than the conspiracies, and the real-world experience is more useful than the miracle claims. This newsletter is for people who want to explore frequency-based listening practically and honestly — and who want better tools to do it with.
Who I am
I’m Yoav. I live on a small farm in Texas with my wife and four kids. I’ve been building software for about twenty years, mostly in marketing technology and audio. For the last few years, almost everything I’ve built has been in service of one specific problem: helping people listen to music in whatever tuning they choose, in real time, without messing with their existing files or libraries.
I’m not a wellness expert. I’m not a sound healer. I’m a builder who got curious about something, went deep, and ended up building a small suite of tools because the ones that already existed didn’t work the way I needed them to.
How I got into this
This part starts where a lot of stories from the last few years start: the pandemic.
Like a lot of people, I spent that period thinking about my health more carefully than I had before. I was reading about sleep, stress, the nervous system, the small daily inputs that affect how you feel. Somewhere along the way I came across the solfeggio frequencies and the broader idea that the specific tuning of music — not just the melody or the lyrics, but the underlying Hz the notes are tuned to — could affect how the listener experiences it.
I’m a music guy. Have been my whole life. My library is north of a thousand albums, most of them carefully curated over years. So the idea that I could listen to that same music in a different tuning, and maybe feel something different from it, was immediately interesting to me.
I went looking for a way to do it.
What I found was disappointing.
The “528 Hz” and “432 Hz” content on YouTube was almost entirely meditation tracks I didn’t actually want to listen to. The few apps that claimed to retune music were clunky in ways that made them basically unusable. Most of them required you to manually convert each song, save a separate file, and end up with five or ten copies of every track in your library — one for each frequency you wanted to try. Some of them used cheap pitch-shifting that distorted the audio. Others only supported two frequencies. None of them did what I actually wanted, which was simple: let me play my own music, in whatever tuning I choose, in real time, without permanently changing the files.
That tool didn’t exist. So I built it.
That first build became HZP — a music player that retunes your library on the fly. It was a personal project. I shared it with friends, then with their friends, and then with strangers on the internet, and it turned out a lot of people had been looking for the same thing. So I kept building.
What started as one app for me is now a small family of tools, each one solving a specific version of the same problem: how do I listen to what I want to listen to, in the tuning I choose, with the least friction possible. That’s the through-line. Everything I’ve built lives somewhere on that map.
Where to go next
The rest of this newsletter is divided into a few main paths. Pick whichever interests you — they don’t have to be read in order.
If you want the science and the explanation
How music retuning actually works → The technical explainer. What “tuning” means, what changes when you retune music, why layering the frequencies into the song isn’t the same thing, and what’s actually happening to the audio when you switch between 440 Hz and 528 Hz.
If you want to test what you’re already listening to
How to find the frequency of any song → The post that walks you through Hz Detect — a free tool I built that tells you what tuning any song is actually in. Let it listen to music on YouTube, your computer or even your radio, get a real measurement. The results are often surprising, and it’s the fastest way to understand the gap between what’s labeled and what’s actually being played.
If you want to retune music as you listen
The right tool depends on where and how you listen.
Music Re-Tuner (browser extension) → The lightweight option. Retunes YouTube, YouTube Music, Apple Music and Spotify in your browser, in real time. Best if you mostly listen on your computer and want to try this without connecting your music library.
Retuner Pro (desktop app, Mac & Windows) → The flagship. Retunes any audio playing on your computer — Spotify, Apple Music, browser, VLC, anything. Real-time, accurate, doesn’t touch your files. This is what I use myself. Paid, with a free trial.
HZP (your music library in any frequency) → The mobile and desktop music player I started with. You import your music collection, hit play, choose a frequency. Available on iOS, Android, Mac, Windows, Car Play, Android Auto and Amazon Fire. Works with Audius or offline.
Player Plus & SFP (single-frequency and offline players) → The focused options. Player Plus is a series of apps each dedicated to a single solfeggio frequency — useful if you’ve found one that works for you and want a simple, distraction-free player for it. SFP (Solfeggio Frequencies Player) is the offline-first option for people who want the whole solfeggio scale in one app. Available across mobile, Windows, and Mac.
What to expect from this newsletter
I aim to publish once a week. The mix is roughly:
Investigations — specific tests and findings about what’s actually in popular “solfeggio” content, written in the spirit of honest curiosity.
Builder notes — what I’m working on, what I’m learning, what’s coming next.
User stories — when people email me with a transformation story worth sharing, I make sure it reaches your inbox.
I try to stay honest about what’s known and what isn’t. I don’t promise miracles. The goal is to give you good information and good tools, so you can decide for yourself what role this kind of listening plays in your life.
If you’re passionate and curious about this as I am, you’re in the right place.
Thanks for being here.
— Yoav
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