[kosta50]

The sound of cosmic background radiation.

Wow, a 30,000 light-year wide radio wave! That's one third of the whole galaxy! And light travels at 186,000 miles/second.

[Alamo-Girl]

The peaks indicate harmonics in the sound waves that filled the early, dense universe. Until some 300,000 years after the Big Bang, the universe was so hot that matter and radiation were entangled in a kind of soup in which sound waves (pressure waves) could vibrate. The CMB is a relic of the moment when the universe had cooled enough so that photons could “decouple” from electrons, protons, and neutrons; then atoms formed and light went on its way.

The Universe may be flat but it is nevertheless musical

I was not surprised when I first read this article because:

And God said, Let there be light: and there was light. - Genesis 1:3

God's Name is I AM.

[TXnMA]

Not to quibble, but it was my understanding that the radio waves themselves are in the microwave domain, and that it is the modulations that have ultra-long wavelengths... Like music modulating a mHz FM signal -- except this "music 'audio'" would require a galactic-sized "subwoofer"... ;-)