the code is open source. I did a but of work a few months back updating it and fixing compilation with rust stable toolchain: https://github.com/khimaros/audioscope
Nightingale & Canary - Bird sounds visualized by Andy Thomas
(and I searched for more and found https://andythomas.com.au/pages/bird-sounds)
That is a snippet of birdsong from that video, plotted on time/frequency axes so you can see the structure of the call. Color denotes sound intensity at a given (time, frequency) region.