Example spectrograms showing the electric moped sounds and the imitations produced by Chinese Blackbirds. (A)–(B) Three examples of locking sound, unlocking sound, and alarms from three ...

Listening to natural sounds is known to be good for human beings, but a new world reveals itself when you visualize sound via colorful images known as spectrograms.

An example of a spectrogram, which scientists use to highlight sound sources based on their visual signatures.