Music notes are symbols that represent a sound’s pitch and duration in musical notation. They are the building blocks of music, allowing composers to transcribe melodies, harmonies, and rhythms onto paper. There are diverse types of music notes and their distinctive roles. A sound produced due to single frequency is called a tone. The sound that is produced due to a mixture of several frequencies is called a note i.e. sound as the sum of waves at many different frequencies. The lowest frequency is called the fundamental, and it is accompanied by higher frequencies which are multiples of the fundamental; these are called overtones or harmonics.

The fundamental frequency vibrates with many other frequencies layered in with it. The fundamental building block of all sounds is the sine wave. More complex sounds are made up of several different sine waves. The collection of all of the different sine waves that make up a sound it is spectrum.

In music theory, the set of overtones is part of what is referred to as the sound’s timbre. Timbre is what makes two musical instruments sound different when they are playing the same note. The musical instruments produce a harmonic sequence of overtones. The fundamental supplies the pitch or note name and the overtones establish the timbre.

A musical note has three characteristics: pitch, loudness, quality or tone. The quality of a note depends upon the waveform. Two notes of the same pitch and loudness, played from different instruments do not sound the same because the waveforms are different and therefore differ in quality or tone. The same note from different instruments has different qualities because the sounds from instruments are never pure notes. Different waveforms are produced by synthesizing (combining) different pure tones of various frequencies and intensities. For this reason, the timbre of a sound varies with the characteristics of the overtones. Timbre is a kind of tonal color that is produced by the instrument's vibrations.

Music is ordered sound based on mixtures of sound waves of different frequencies. There are many modes of vibration each with its own vibrational frequency. This set of frequencies is called an overtone series and can be a non-harmonic, a harmonic, or a partial harmonic series.

In physics, a harmonic is wave with a frequency that is a integer multiple of the fundamental frequency of a periodic signal. As all harmonics are periodic at the fundamental frequency, the sum of harmonics is also periodic at that frequency. The set of harmonics forms a harmonic series.

Any note played at different octaves will sound distinct . All pitches are organized sequentially – this sequence forms scales that are fundamental to constructing melodies and harmonies.

Pythagoras, twenty-five hundred years ago, had established the science of music through his study of vibrating strings. By study of sacred numbers represented by gematrical vectors and matrixes was discovered a new way represented musical harmonies by special harmonic series.

Gematrical matrix can be represented by a set of harmonic series. Because Hebrew's letters and letter combinations can be calculated and represnted by gematrical matrix, for this reason, harmonic series can be calculated for letters, words and verses in Hebrew. Musical harmonic series are musical patterns. There exist many ways of calculations of harmonic series of Hebrew's letters and letter combinations and their transformation into melodies and chords, which can be executed using computer or manually.