# Colors of Notes

In previous lessons, we have learned about the relationship between notes and frequencies and what is an octave. In this lesson, we will learn why myChordBook shows each note with a different color.

Similar to chords, notes are also waves. Each color has a unique frequency. Human ear can hear frequencies (sound) from 20 Hz to 20kHz. Likewise, human eye can see frequencies (color) from 430 THz to 770 THz. (1THz = 1012 Hz).

Also in What is Octave Lesson, we have learned that for an octave higher, we have to multiply the frequency of a note by 2. So, one might think that if we multiply the frequency of a note by 2 multiple times, eventually we will come to the frequency range of human eye. This shows us that each note can be represented with a color!

Let's do it. Below, we calculated the frequencies of 40th octave by multiplying the frequencies of notes by 240. Colors that corresponds to the calculations are also shown in the table.

## Color-Note Table

 Note La La sharpSi bemol Si Do Do sharpRe bemol Re Re sharpMi bemol Mi Fa Fa sharpSol bemol Sol Sol sharpLa bemol 4-5th Octave (Hz) 440 466 494 523 554 587 622 659 698 370 392 415 40th Octave (THz) 484 513 543 575 610 646 684 725 768 407 431 457 Color Symbol A A#Bb B C C#Db D D#Eb E F F#Gb G GAb

Note that, we have slightly optimized the colors to to make them readable on displays.

## Benefits of Color Notation

Many researches have been showed that using colors when displaying notes provides better understanding and learning the notes. Colors make it easy to remember the notes.

Next we will learn about scales.