Traditional / experimental practice
Solfeggio frequencies
A traditional or spiritual practice, not a scientific claim.
Music history and modern interpretation
In the 11th century Guido of Arezzo used the first syllables of a hymn's lines (ut, re, mi, fa, sol, la) as note names. These syllables are the ancestors of today's do-re-mi. The hertz list in circulation today does not come from that history; it is a modern spiritual interpretation.
In Frekans Studio
We offer Solfeggio tones in the Explore section with a ✦ T strip, as a listening ritual. Lists that attach medical meanings are not included in the product.
What does the evidence say?
A modern spiritual interpretation; not a scientific claim.
✦ T · Traditional/spiritual practice- What do we know?
- Medieval solfège syllables (ut, re, mi…) are real music history. Today's list assigning Hz values to them is a modern spiritual interpretation, popularized by a non-peer-reviewed book published in 1999. Lists vary between sources: some count six tones, others nine.
- What don't we know?
- The meanings given to the tones have not been scientifically tested, and different sources assign different meanings.
There is one small study and one biomarker trial; it has not been reliably shown that 528 Hz reduces stress.
■ D · Insufficient evidence- What do we know?
- In a small 9-person study, salivary cortisol fell and tension scores decreased after 528 Hz music; randomization and blinding were not reported. In a randomized trial with 162 students in Türkiye, 528 Hz music raised salivary BDNF and CREB.
- What don't we know?
- What these biomarker changes mean for everyday stress is unclear; attention-test performance did not differ between groups in the same trial. The findings have not been independently replicated.
Evidence levels and sources come from the database; the article adds no new claims. Evidence methodology
Frequently asked questions
- Does each frequency have its own effect?
- Different sources attach different meanings, and these have not been tested. Small studies on 528 Hz are summarised on the 528 Hz page.
Listen and try
Last updated: 1 October 2026 · This article is for information only; it is not medical advice.