It happened millions of years ago when only a few creatures inhabited earth and all of them lived underwater.

Or most of them. It is entirely possible that a daring worm was lying on the beach, enjoying the hot sun and the cooling breeze coming from the ocean to travel up and over the dunes. There, the air weaved its way through a field of purple plants. They had hollow stems, and so when the wind passed, they became a field of flutes.

That morning, out of nowhere, that field produced a D flat major 9th chord with an F in the base. It was the first time the chord was heard, at least on this planet, and the effect must have been breathtaking.

It took an eternity before the chord was played again. But when you hear it today - and it does happen much more frequently now - you will know what it was like on that day behind the dunes. It’s not uncommon for anyone to get a little bit emotional over it, without exactly knowing why.