links to explanations of visual representations of sound

Representing Sound Visually (waveforms, spectrograms, frequency spectrum)

1.waveform diagram explanation

2.spectrograms: an introduction

3.spectrograms: instruments and timbre

4. Blog (British Library): Seeing Sound

https://blogs-archive.bl.uk/sound-and-vision/2018/09/seeing-sound-what-is-a-spectrogram.html

5. Animated frequency spectrum, animated spectrogram

https://dosits.org/science/measurement/how-are-sounds-viewed-and-analyzed/