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This is 99% Invisible. I'm Roman Mars.

This week the radio audience got a rebroadcast of episode number 10 about Chris Downey the Blind Architect, which is often cited as an audience favorite, so you should go download it if you haven't heard it already.

That's episode number 10, called 99% Sound and Feel.

But for you podcasters, I'm pushing out a special never before released piece that served as the basis for episode number 3. I'm 99% Invisible, but it's never aired and it's full glory until now.

Think of it as a slightly thesis shifted double length directors cut of episode number 3.

This story is about how a new technology in this case, the smartphone and the RJDJ adaptive music app can not only change your consumption of music, but can also be a little more interesting.

And also change the very nature of music itself. I think it's actually a pretty stunning development in the evolution of music and has even bigger implications than it seems on the surface.

So check it out.

When I moved out to San Francisco a dozen years ago, I stopped over in LA to visit my friend Max.

And as he drove me around the Hollywood Hills, the song Screen Riders Blues by Soulcoff came on the car stereo.

And it seemed to sync up with everything in the world at that moment. When the turn signal was flipped on, it always kept the beat.

Headlights whizzed by in concert with the bass loop. And the song would crescendo just as a new amazing vista presented itself through the windshield.

And it's why they am. And you are listening to locks and joy.

If you're of the Walkman generation or the iPod generation or if you take a lot of drugs, you've probably had this happen to you.

And Michael Bridenbroker is a big fan of the sort of musical serendipity.

That for me was always very magical moments. That's one of the reasons he created RJ DJ. A musical iPhone app that tries to give you that feeling every time you put on your headphones.

We're combining the world around you with your listening experience. So the door closes and something really amazing acoustically could happen.

Then I'm always feeling like I'm more in a movie, but basically take the movie away and put your life into it. And that's RJ DJ.

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