In 1897 german physicist K.F.Braun engineered the first oscilloscope.

Following the discovery of fast Fourier transform, in 1962 the first spectrum analyzer was engineered.

Use of spectrum analyzer provides a plot and trace of signal amplitude in the frequency domain.

There are two types of spectrum analyzers: swept-tuned and time-sequence.

Since 1939 binding sound for pitching musical instruments is in 440Hz frequency. Formerly it was 432Hz.

Oscilloscopes are used to observe the change of electrical signal over time.

Nowadays there are many kinds of spectrum analyzers: stationary, portable, handhled and networked.

Chords contain tierces (thirds).

Three crossed turning forks are in Yamaha brand logo.

Osciloscopes are used not only in the audio (music) industry, but also science laboratories, hospitals and clinics.

There are two type of chords- consonant chords and disonant chords.

The first of real time computer games was made for oscilloscope. "Tennis for two" was programmed by William Higinbotham in 1958....

Some artists use oscilloscope waveforms to make certain patterns. They are able to create eye-catching mandalas or floral shap...

Chord consists of minimum three diffrent notes.

Tuning fork was invented by lute musician.

Laryngologists use tuning forks in 432Hz becouse that's the frequency human body transcribes the best.