396 Hz benefits: guilt, fear and the evidence

What are the claimed benefits of 396 Hz?

The benefit claimed for 396 Hz is emotional: letting go of guilt and fear. The earliest list Harmonance could find that gives each Solfeggio tone a purpose is on David Hulse's SomaEnergetics site, in a copy the Internet Archive kept in 2002. His list opens with UT, 396 Hz, "Liberating Guilt and Fear", and credits the tones to Dr Joseph Puleo.

Later descriptions made it a tone of release and grounding. Harmonance's older 396 Hz videos speak of releasing fear and tie it to the root chakra, and its 396 Hz page now calls it Release and Steadying. A 2023 paper in the journal Sensors repeats the claim, that the tone "helps people eliminate feelings such as fear, guilt, and grief", but prints the number as 96 Hz, a digit lost on the way. The two studies it cites for its list played music with amplified high or low notes and music tuned to 432 Hz. Neither played 396 Hz.

No instrument measures guilt, so the claim has never been tested as stated. What can be checked is where the number came from, which note it is, and what happened in the one study that measured the body while it played.

Where does the number 396 come from?

From the digits of verse numbers in the Bible. Healing Codes for the Biological Apocalypse, a 1999 book by Leonard Horowitz and a co-author writing as Dr Joseph Barber, presented six numbers as the missing tones of an ancient Solfeggio scale, and 396 came first. The publisher's news release said Barber was "intuitively guided to find the pattern of six repeating codes in the Book of Numbers, Chapter 7, verses 12 through 83", decoded by "reducing the verse numbers to their single digit integers".

Numbers 7 lists the gifts twelve tribal leaders brought to the tabernacle, one leader a day, six verses a day. Each day opens the same way. Verse 12 reads "And he that offered his offering the first day was Nahshon", verse 18 "On the second day Nethaneel", and verse 24 "On the third day Eliab". Add up the digits of each verse number: 1 + 2 makes 3, 1 + 8 makes 9, and 2 + 4 makes 6. Read together, the first verses of the first three days make 396, and every later group of three days gives 396 again.

The other five places in each day give 417, 528, 639, 741 and 852, as the 852 Hz guide's verse table shows. The pattern belongs to the counting, not to the words: the guide to 528 Hz shows that any run of numbers starting on one whose digits add up to 3 gives the same six. Horowitz himself, answering a critical review of the book, wrote: "We ask forgiveness for our limited knowledge in the fields of music and physics."

What does 396 Hz mean, and why is it called UT?

In the Solfeggio set, 396 Hz is UT, the first note, and it stands for liberating guilt and fear. It is called UT because it came first. The book matched its six numbers to the six syllables of a medieval singing scale, UT, RE, MI, FA, SOL and LA, taken from Ut queant laxis, a Latin hymn to Saint John the Baptist. Each of its first six half lines begins one note higher, and each syllable starts one of them, so UT is the hymn's first word. The guilt in the claim has an echo in the hymn's own prayer: "So that they may, with loosened voices, resound the wonders of your deeds, clean the guilt from our stained lips, O Saint John." UT is now mostly sung as Do.

In the hymn's melody the half lines start on "the first six notes of the diatonic scale of C", as the Catholic Encyclopedia puts it, so the hymn's UT is a C. And a syllable named a step, not a fixed pitch. Grove's Dictionary of Music and Musicians says "the same syllable is not always found in conjunction with the same letter": UT could stand on C, F or G.

The 1999 release gave UT a definition of its own. It said UT "is defined in Webster's Dictionary as 'the Gamut of dramatic emotion from grief to joy,' and 'the whole series of recognized musical notes.'" Those are Webster's words for another word. Merriam-Webster's entry for gamut reads "the whole series of recognized musical notes", then "an entire range or series", and traces the word to the "lowest note in the medieval hexachord system".

That lowest note was a G. The lowest hexachord, Grove explains, "begins on G, the first line in the bass", a note Guido of Arezzo called gamma, "whence the word gamma-ut, or gamut": UT sung on G. So the dictionary words chosen to define 396 Hz describe a word that names UT on a G, and 396 Hz is, near enough, a G.

What note is 396 Hz?

A G, 17.6 cents above the G above middle C. Standard tuning puts A at 440 Hz, fixed by the ISO 16 standard, and each semitone is the twelfth root of 2. The G a tone below that A is 440 times 2 to the power of minus 2/12, which is 392.00 Hz. 396 Hz sits 17.6 cents above it, about a sixth of a semitone: close enough to sound like that G, and sharp enough to beat against a piano's G about four times a second.

In just intonation, tuning by whole-number ratios, 396 Hz is that G exactly. The just major scale in its smallest whole numbers is 24, 27, 30, 32, 36, 40, 45 and 48, as five-limit tuning sets it out. Multiply by 11 and it becomes 264, 297, 330, 352, 396, 440, 495 and 528 Hz: a C major scale whose A is exactly 440 Hz, whose G is 396 Hz and whose upper C is 528 Hz. So 396 is 440 times 9/10, and 528, as the 528 Hz guide shows, is 440 times 6/5.

The two scales, note by note

Note	Just, Hz	Equal, Hz	Cents
C	264	261.63	15.6
D	297	293.66	19.6
E	330	329.63	2.0
F	352	349.23	13.7
G	396	392.00	17.6
A	440	440	0
B	495	493.88	3.9
C	528	523.25	15.6

The two Solfeggio tones in that scale are a perfect fourth apart: 396 to 528 is exactly 3 to 4. The release said the six tones hold "harmonic sequences similar to those found in the 'wedding march'" without saying where. This pair is one that fits: the Bridal Chorus from Wagner's Lohengrin, the tune known as "Here Comes the Bride", opens with a perfect fourth.

Is 396 Hz the root chakra frequency?

Online it is matched with the root chakra, but the tradition gives the chakra no pitch. Muladhara, the root chakra, is one of seven primary chakras in Hindu tantra, pictured as a lotus with four petals, pink or red, with the earth element drawn as a yellow square. Nothing in that picture is a frequency.

The pairing of each Solfeggio tone with a chakra is a modern overlay, made long after the numbers. Harmonance offers it as an intention to listen with, not an effect. The guide to chakras and frequencies sets out how the pairings are made and what they rest on.

What happened when researchers played 396 Hz to people?

In the one study that measured the body during 396 Hz, skin conductance dipped slightly while it played, and the dip was not significant. A university team in the United States played six pure tones, 396 to 852 Hz, to 18 healthy adults aged 17 to 75, five minutes each in rising order with a 30 second break, from a speaker about 15 cm away at 75 to 79 dB (Presley, Stamps and Davis Alexander (2026), Journal of Scientific Exploration). They recorded skin conductance, the skin's readiness to carry a tiny current, which rises with arousal.

Against the reading before the tones, 2.96 microsiemens, 396 Hz gave 2.63: "a slight, insignificant decrease". Every tone after it read higher than the one before. The rises for 741 Hz, 852 Hz, all six together and the reading after the tones were significant, and the highest reading of all came after the tones had stopped. Twelve of the 18 described their mood as neutral or content before and 11 after; six reported joy before and two after; and afterwards five said they felt annoyed, tired or less calm.

The readings, in session order

Reading	Mean, microsiemens	Against before
Before	2.96	the baseline
396 Hz	2.63	lower, not significant
417 Hz	2.82	lower, not significant
528 Hz	3.05	higher, not significant
639 Hz	3.24	higher, not significant
741 Hz	3.42	higher, significant
852 Hz	3.69	higher, significant
All six together	3.98	higher, significant
After	4.01	higher, significant

Download the readings (CSV)

The paper prints only the first two means. Harmonance read the other seven from its Figure 1 in code, checking the reading against the two printed means; they agree to within 0.01 microsiemens.

What the study cannot show is what 396 Hz did. It always came first, straight after the quiet baseline, so its dip cannot be told apart from the early part of the session, even though the team allowed a silent settling-in period before the baseline. Every later tone came later in the session too, and the reading kept rising after the tones stopped, so the climb follows time as closely as pitch. The authors say as much: "Next steps include randomizing frequencies to account for sequential increases versus exposure."

One other test played 396 Hz, and it asked how the tone sounded, not what it did. In an online test, 37 adults rated twelve pure tones, 20 seconds each in rising order, for how happy, sad, calm and angry each sounded, judging each against the tones either side of it (Kumar, Abhayapala and Samarasinghe (2022), Acoustics). On the paper's graph, 396 Hz scored about 5.0 out of 10 for calm and 4.4 for anger: the highest tone still rated calmer than angry, though well below the 6.7 for calm at 285 Hz. The 417 Hz guide charts all twelve.

Beyond these two, Harmonance found no study that played 396 Hz to people; none of the 154 records PubMed returns for 396 Hz is one. A 2026 review of music and tones after brain injury and stroke weighs 432, 528, 639, 741 and 852 Hz, finds "little direct empirical evidence supporting these individual frequencies", and does not discuss 396 Hz at all (Whitney and colleagues, Cureus). Research on music in general is still young: NCCIH notes that "because much of the research on music-based interventions is preliminary, few definite conclusions about their effects have been reached".

For listening, the ratings point one way: if calm is what you are after, those listeners heard the tones below 396 Hz as calmer still. Try 396 Hz beside 285 Hz and 174 Hz, and notice which one settles you.

What does the 396 Hz page play?

Two different sounds, and Harmonance measured both from the page's own audio files. With Strings off, the page plays a 396.00 Hz tone, measured to a hundredth of a hertz, with its second and third harmonics at 792 and 1188 Hz, 23.1 and 34.0 dB quieter than the tone. They are there by design: the file's recipe adds them at 7% and 2% of the main tone's strength, so even the plain tone is not a bare sine wave.

With Strings on, cello and viola carry the sound. They are scored on twelve notes between 49.5 and 166.5 Hz, in a key whose home note is 49.5 Hz, exactly three octaves below 396 Hz. With the overtones of those notes, 91% of the strings' power lies below 400 Hz and half of it below 249 Hz. The 396 Hz tone runs underneath, 37.4 dB below the strings as a whole. To hear 396 Hz itself, keep Strings off; for a lower, fuller sound built on it, switch Strings on.

The 396 Hz page, measured

Strings	What was measured	Result
Off	The tone	396.00 Hz
Off	The 792 Hz harmonic	23.1 dB below the tone
Off	The 1188 Hz harmonic	34.0 dB below the tone
On	The strings' home note	49.5 Hz, three octaves down
On	Share of the strings' power below 400 Hz	91%
On	Half of the strings' power lies below	249 Hz
On	The 396 Hz tone against the strings	37.4 dB quieter

Download the measured spectra (CSV)

How do you listen to 396 Hz?

Press play on the 396 Hz page at a low volume and give it ten to twenty minutes. Nothing plays until you press play, and no account is needed. With Strings off it is one steady tone, so any speakers or headphones will do. To hum along, 396 Hz suits a higher voice, and 198 Hz, an octave down, a lower one; either stays in tune with it.

The risk in listening is level and time, not pitch. The World Health Organization puts safe listening at 80 dB for up to 40 hours a week and suggests keeping a device at no more than 60% of its maximum. The US National Institute on Deafness and Other Communication Disorders says sounds at or below 70 dBA "are unlikely to cause hearing loss", even over long listening. Quiet enough to talk over is quiet enough.

Two of the feelings pages offer 396 Hz: feeling anxious, where it comes first, and wanting to feel grounded, after 174 Hz. Harmonance Studio lets you layer it with other tones, and the Solfeggio collection holds the whole family. The guides to 417 Hz, 528 Hz, 174 Hz and 852 Hz follow the same numbers, and the introduction to the Solfeggio frequencies sets out the whole scale.

Sources and limits

The history comes from the archived pages of the people who made the claims, the music from standard references and the tuning from arithmetic anyone can redo. The research is two small studies: skin conductance in 18 people and an online rating test of twelve pure tones. Both played the tones in a fixed rising order, with 396 Hz first in one and fifth of twelve in the other, and neither can say what 396 Hz does for anyone. The skin conductance figures past the first two are read from the paper's graph, and the ratings from another graph, not from tables. The measurements of the 396 Hz page are Harmonance's own, made from the page's audio files. No study has tested whether 396 Hz releases guilt or fear.

1. David Hulse, SomaEnergetics, the Solfeggio scale frequencies (Internet Archive copy, 2002): the earliest list of meanings found, with 396 Hz as UT, "Liberating Guilt and Fear".
2. Tetrahedron Publishing, news release for the 1999 book (Internet Archive copy): the Numbers 7 method and the dictionary words given for UT.
3. A review of the book and Leonard Horowitz's reply (Internet Archive copy): the author on the book's limits, and the co-author's pen name.
4. Numbers 7, King James Version, eBible.org: the verses that open each day.
5. Ut queant laxis, Wikipedia: the hymn, its translation and UT becoming Do.
6. Hugh Henry, Ut queant laxis, The Catholic Encyclopedia (1912): the hymn's first six notes.
7. W. S. Rockstro, Hexachord, Grove's Dictionary of Music and Musicians (Wikisource): what a syllable named, and gamma-ut.
8. Merriam-Webster, gamut (Internet Archive copy): the dictionary words and where the word comes from.
9. A440 pitch standard, Wikipedia: standard tuning, ISO 16.
10. Five-limit tuning, Wikipedia: the just major scale in whole numbers.
11. Perfect fourth, Wikipedia: the interval and the Bridal Chorus.
12. Muladhara, Wikipedia: the root chakra in tantric tradition.
13. Presley, Stamps and Davis Alexander (2026), Evaluating the Effects of Pure Tone Solfeggio Frequencies on Skin Conductivity, Journal of Scientific Exploration: 396 Hz and skin conductance in 18 people.
14. Kumar, Abhayapala and Samarasinghe (2022), frequency cues for human emotions, Acoustics: 37 adults rating twelve pure tones.
15. Modran and colleagues (2023), Sensors: the guilt and fear line and the studies behind it.
16. Whitney and colleagues (2026), a review in Cureus: little direct evidence for single frequencies.
17. NCCIH, Music and health: what research on music does and does not show.
18. World Health Organization, safe listening: level and time.
19. NIDCD, noise-induced hearing loss: levels unlikely to harm hearing.