Claim reviewed: Each Solfeggio frequency (174-963 Hz) carries a specific spiritual meaning.
A traditional or spiritual practice, not a scientific claim.
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.
Wording we use in the app: A modern spiritual interpretation; not a scientific claim.
Sources (1)
Horowitz ve Puleo 1999 · Book (not peer-reviewed)
One of the books that spread the modern 'Solfeggio frequencies' interpretation. It is not a peer-reviewed scientific study; it is cited to show where the interpretation comes from.
Horowitz LG, Puleo J. Healing Codes for the Biological Apocalypse. Tetrahedron Publishing Group; 1999. ISBN 0923550399 Go to source
Last reviewed: 3 October 2026 · Next review: 3 April 2027