What Is 963 Hz? The Highest Solfeggio Tone in Numbers, Where It Came From, and How We Use It

963 Hz is the highest of the nine Solfeggio frequencies and is usually described in the tradition with words like awakening or connection. This page separates what 963 Hz is as a sound, what is tradition and what is research, and how we use it.

What 963 Hz is (by calculation)

At 963 Hz a pure tone is clearly high and, at the same playback level, sounds louder and sharper to the ear than the lower Solfeggio tones; the ear is more sensitive in this range. On the piano it falls between A♯5 and B5, nearer B5. It is about 212 cents above 852 Hz, slightly wider than a whole tone.

Distance to the other Solfeggio frequencies

100 cents is one semitone. Many of these distances fall between the intervals of ordinary music, which is one reason Solfeggio combinations sound unusual.

Where the number came from

The Solfeggio system became widely known after Leonard Horowitz’s 1999 book, which describes Joseph Puleo deriving 396, 417, 528, 639, 741 and 852 from verse numbers in the Book of Numbers. That account comes from the system’s proponents; no independent historical source has been found. 174, 285 and 963 Hz were added later. The often-repeated link to medieval Gregorian chant does not hold: there was no hertz unit and no fixed pitch standard in the Middle Ages, and the hymn Ut queant laxis gave us the syllables do-re-mi, not frequencies.

What research says (as of October 2026)

No peer-reviewed study testing the effects of 963 Hz in people was found. Among the nine Solfeggio frequencies only 528 Hz has human studies, and those are small (the 528 Hz research summary). The descriptive names attached to 963 Hz come from the tradition and from listeners’ accounts.

How we use it

We use it mostly as the end point of sequences, such as 432 → 963 Hz or 528 → 852 → 963 Hz, and keep it quieter than the low layers because of how strongly high tones reach the ear.

As of October 2026, 28 of this channel’s published videos use 963 Hz (10 long-form). Some of the long ones:

• The Heart Sutra · 1 Hour Cosmic Meditation · 963Hz 🌌 (60 min)
• 963Hz Japanese Zen Meditation Music · Cosmic Consciousness & Universal Connection (60 min)
• Harvest Moon · 963Hz Sleep Music · 1 Hour of Gold Moonlight, Still Water & the Lunar Capital (60 min)
• 963Hz · 20 Min cosmic tones Focus · Big-picture, transcendent deep work · Study & Deep Work (20 min)
• Amaterasu — Dawn from the Cave · 963→528Hz ☀ (10 min)
• Summer Night Passage · 396→432→528→963→639Hz (10 min)

None of these tracks plays a bare 963 Hz sine wave for its whole length; the tone is wrapped in overtones and layered with other sounds so it can be listened to for a long time.

Listening notes

• Start quietly. Pure tones reach the ear more strongly than music at the same level.
• Pure tones are for checking a pitch; for relaxing, a composed track is a better fit.
• This page does not promise any physical or mental effect. If you have health concerns, please see a doctor.

Frequently asked questions

Is 963 Hz harsh?

As a pure tone at normal volume it can feel sharp. Keep the level low, or listen to it inside composed music.

Which piano note is 963 Hz?

None exactly: it is about 44 cents below B5 (987.77 Hz).

Why is 963 Hz often the last tone in a sequence?

Being the highest of the nine, it works as an arrival point when a piece rises through the list. That is a musical choice, not a measured effect.

Related

• Solfeggio frequencies: the nine tones
• Frequency Lab (play and compare)