The 9 solfeggio frequencies, explained

The nine solfeggio frequencies are 174, 285, 396, 417, 528, 639, 741, 852 and 963 Hz. Each is linked to a theme, from grounding at 174 Hz to the “miracle” tone at 528 Hz and the higher self at 963 Hz. Play all nine free below and see what each one is traditionally used for.

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Solfeggio frequency chart

Kaleidoscope artwork generated from the 741 Hz Clarity frequency
741 Hz frequency, visualized. Every SleepHz artwork is generated from the frequency itself: its number sets the symmetry and the pattern.
FrequencySyllableKnown asCommonly used for
174 Hz–FoundationGrounding, physical relaxation
285 Hz–RestoreRest and renewal
396 HzUtReleaseLetting go of fear, guilt and scarcity
417 HzReChangeBreaking old patterns
528 HzMiTransformation (miracle)Love and self-healing meditation
639 HzFaConnectionRelationships
741 HzSolClarityCleansing, clear thinking, expression
852 HzLaIntuitionInner vision and awareness
963 Hz–Higher selfSpiritual connection

Where do the solfeggio frequencies come from?

The syllables come from Ut queant laxis, an 8th-century hymn that Guido of Arezzo used in the 11th century to teach singing. Each line started one note higher: ut, re, mi, fa, sol, la.

The frequencies themselves are modern. Joseph Puleo described the six-tone set in the 1970s, it was popularized in the late 1990s, and 174, 285 and 963 Hz were added later to make nine. Medieval singers had no way to measure hertz, so these numbers aren't historical pitches.

Which solfeggio frequency should I start with?

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Solfeggio frequencies FAQ

What is the most powerful solfeggio frequency?

None is proven to be stronger than another. 528 Hz is the most popular, so it's a natural first choice.

Are solfeggio frequencies scientifically proven?

No. Their meanings are traditional and popular associations. Many people simply find the tones relaxing.

Can I listen to all 9 in order?

Yes. Some people move from 174 Hz up to 963 Hz, a few minutes each, as a full-scale meditation.

Do I need headphones for solfeggio frequencies?

No. They're pure tones and sound fine on any speaker.