Another post mentioning Ludovico Einaudi...

Below is a spectrogram of L'Origine Nascosta ("the hidden source") from his album Divenire ("to become").

Time goes from left to right (the song is just over 3 minutes long) while frequency (pitch) increases from the bottom to the top of the picture. You can see individual piano notes (red patches) followed by reverberation (blue-green streaks).

It's a delicate piano piece but with an extraordinary orchestral swelling in the middle which you can clearly see in the image above.

(Sound analysis by Overtone Analyzer Live 1.1.1.)

This post was originally on LiveJournal.