I don't get it. I mean, I understand what I'm looking at; a word cloud of music genres that is each linked to a sample. That part I got. But when you label your website 'Every Noise at Once'... I kind of expect to hear multiple (perhaps not 'every') noises at the same time.
White noise is equal energy across all frequencies linearly. Sounds hissy because there are more frequencies included within each musical octave as you go higher.
A more even-sounding spectrum is pink noise which is equal energy per base 2 logarithmic bandwidth. Sounds like a waterfall.
You should look up 'black noise' on the chart. It's music generated using MIDI so that the printed score maximises the quantity of black ink used. The "music" aspect is like listening for the whitespace in a sea of sound.