The original idea wasn't making a sound spectrogram. I was looking for some sound spectrogram libraries to use in one of my personal projects, but found a lot of them are not what I wanted. Until I hit this project on Chrome Experiment: It's here. It is an amazing work and I'm totally blown away by how beautiful it is. So I changed course, I wanted to make something like this. However, I didn't want to make the exact same thing, I want something a bit different. So Marching Cubes! I experienced with Marching Cubes in Unity before, so I know how to do it. Here is my little experiment.
You can play with it here. More information is on my webiste here. You can use your microphone, use my selected soundtracks and your own.