Musical Frequencies
G#1
51.91 Hz
Note: G#1
Cosmic Octave Color
Derived visible color (657 nm)
Display swatch #d14d2d
EstablishedMusical Standard
Evidence Level
Established
Source Count
1
Last Reviewed
March 23, 2026
Directly measured, standardized, or well-supported in mainstream scientific or technical literature.
This entry documents a musical reference or standard. It should be read as an acoustic and musical reference rather than a biological claim.
Review the evidence modelMusical note G# in octave 1. Sub-bass range.
Period
19.26 ms
Wavelength
6.61 m
Nearest Note
G#1 (0¢)
Claim Type
Musical Standard
Cosmic Octave Color
Derived visible color (657 nm) · #d14d2d
Source
Equal temperament tuning system (A4 = 440 Hz)
Sources
Equal Temperament Tuning System
108 atlas references
The twelve-tone equal temperament reference used for note-frequency lookups throughout the atlas.
Standard equal-temperament note table with A4 = 440 Hz.
Harmonic Series
Octave Ladder
Every audible octave of this frequency — the same tone, higher and lower.
Nearby in the Atlas
Entries within ±35 cents of this tone when reduced to the same octave — candidates for pairing or comparison.
G#3Musical Frequencies
207.65 Hz+0.1¢
G#4Musical Frequencies
415.30 Hz+0.1¢
G#5Musical Frequencies
830.61 Hz+0.1¢
G#6Musical Frequencies
1.7 kHz+0.1¢
G#7Musical Frequencies
3.3 kHz+0.1¢
G#8Musical Frequencies
6.6 kHz+0.1¢
musicequal-temperamentoctave-1