What Is 528 Hz Music? Meaning, Research & How to Make Your Own
What “528 Hz” actually means
Nearly all modern music is tuned to a reference pitch where the A above middle C vibrates at 440 times per second (440 Hz). In that system, the C above it sits at about 523.25 Hz, close to 528 but not on it. To make C land exactly on 528 Hz, you raise the whole tuning reference to roughly A = 444 Hz.
That's a small change: about 16 cents, or one-sixth of a semitone. Every note moves up by the same tiny amount, so the melody, harmony and rhythm stay the same. Most people can't tell the difference unless they compare the two versions side by side.
Where the idea came from
528 Hz is one of the so-called Solfeggio frequencies, a set of six tones popularized in the 1990s. They're often described as ancient, but the frequency values themselves trace back to numerology done in the 1970s, not to medieval music. The most famous claim, that 528 Hz “repairs DNA,” comes from the same popular books and has never been demonstrated scientifically.
What the research says
The 2018 Juntendo University study
The study cited most often is a small Japanese experiment. Nine healthy adults listened to the same soothing piano music tuned to 528 Hz on one day and to standard 440 Hz on another. After the 528 Hz session, researchers measured lower salivary cortisol (a stress hormone), higher oxytocin and lower self-reported tension and anxiety. They saw no significant change after the 440 Hz session.
It's an interesting result, but with only nine people it's a starting point, not proof. The authors themselves noted that the various effects claimed for Solfeggio frequencies have no scientific basis. That's why they ran the experiment.
A larger 2026 study
A study of 162 university students during exam season compared 528 Hz music, 432 Hz music and no music, and found different patterns in several blood markers between the groups. The lead researcher explicitly cautioned against concluding that any frequency “heals” anything or reduces stress based on their data.
The honest takeaway
Calm music reliably helps many people relax. Whether the exact tuning adds anything on top of that is still an open question. Enjoy 528 Hz music because you like how it sounds and feels, not as a treatment. For health concerns, talk to a professional.
528 Hz music vs. a 528 Hz tone
You'll find two different things online under the same label:
- Retuned music: regular songs shifted so they sit in “528 tuning.” This is what PurrHz creates.
- Pure tones: a steady 528 Hz sine wave or drone, often layered under ambient music.
PurrHz can do both: retune your song, then optionally blend in a soft 528 Hz tone underneath.
How to make your own 528 Hz version
- Start with a good file. WAV, FLAC or a 256–320 kbps MP3 gives the cleanest result.
- Drop it into PurrHz. It reads your file and detects the song's current tuning.
- Choose 528 Hz and keep Pure pitch mode for the most transparent sound.
- Compare and download. A/B it against the original, then save a lossless WAV.
Everything happens in your browser. Your music is never uploaded.
Try it: convert a song to 528 Hz, free and private 🐾Sources
- Akimoto K. et al. (2018). Effect of 528 Hz Music on the Endocrine System and Autonomic Nervous System. Health, 10, 1159–1170.
- PsyPost (2026). Listening to specific music frequencies alters stress markers in students facing exams.
- Science Feedback. No evidence to support claims about Solfeggio frequencies.