I think that it is part the brains natural tendency to organize itself around repetitive and predictable patterns, plus you're introduced to our western scale from the very first songs your parents sing to you as a baby.

The experiment from the first video would be interesting to try with an isolated tribe in the Amazon that haven't 'discovered' music yet. If that exists. Organizing sounds in patterns like the brain organizes everything else into patterns probably always leads to music at some point. One of the most amazing ways of making music I saw was a tribe that was rhythmically splashing and pounding on water in a creek to make different noises which all blended together beautifully.

Exposure to music since birth certainly plays role but our minds do have certain organizational method when it comes to music, or in fact sounds in general. I like to think that all our senses affects our brain functionality which influences our emotions that ultimately molds our very personality, us. That's where point of view and perception meet.

Music and sounds effecting emotion is a given. We have 2 kids and it's very obvious how effective singing, music or relaxing background sounds are to calm a baby down and help him or her sleep. And I just stopped in the middle of my thought process because a good song came on. Certain soundtracks will give me goosebumps and more then half of the emotion in movies come from the music.
I'll watch the 2nd video tonight when I have time, I'm curious what they have to say. Hopefully there will be a few pointers how to get rid of a song that is stuck in your head :) What's that all about.

Musical awereness is a big part of perception. Different cultures have differen musical styles. The funniest thing was watching Paul Merton in China, trying to sit through a 6 hour Chinese opera. "It's making my ears bleed"
It's also a big part in generational awareness. Those kids nowadays don't know what real music is!

Hearing Bobby McFerrin talk about how audiences want to participate made me think of these group mind experiments. http://www.kk.org/outofcontrol/ch2-b.html
I can't find the video of it atm but it's just as fascinating to read.

" Loren Carpenter launches an airplane flight simulator on the screen. His instructions are terse: "You guys on the left are controlling roll; you on the right, pitch. If you point the plane at anything interesting, I'll fire a rocket at it." The plane is airborne. The pilot is...5,000 novices. For once the auditorium is completely silent. Everyone studies the navigation instruments as the scene outside the windshield sinks in. The plane is headed for a landing in a pink valley among pink hills. The runway looks very tiny.

There is something both delicious and ludicrous about the notion of having the passengers of a plane collectively fly it. The brute democratic sense of it all is very appealing. As a passenger you get to vote for everything; not only where the group is headed, but when to trim the flaps.

But group mind seems to be a liability in the decisive moments of touchdown, where there is no room for averages. As the 5,000 conference participants begin to take down their plane for landing, the hush in the hall is ended by abrupt shouts and urgent commands. The auditorium becomes a gigantic cockpit in crisis. "Green, green, green!" one faction shouts. "More red!" a moment later from the crowd. "Red, red! REEEEED!" The plane is pitching to the left in a sickening way. It is obvious that it will miss the landing strip and arrive wing first. Unlike Pong, the flight simulator entails long delays in feedback from lever to effect, from the moment you tap the aileron to the moment it banks. The latent signals confuse the group mind. It is caught in oscillations of overcompensation. The plane is lurching wildly. Yet the mob somehow aborts the landing and pulls the plane up sensibly. They turn the plane around to try again.

How did they turn around? Nobody decided whether to turn left or right, or even to turn at all. Nobody was in charge. But as if of one mind, the plane banks and turns wide. It tries landing again. Again it approaches cockeyed. The mob decides in unison, without lateral communication, like a flock of birds taking off, to pull up once more. On the way up the plane rolls a bit. And then rolls a bit more. At some magical moment, the same strong thought simultaneously infects five thousand minds: "I wonder if we can do a 360?"

Without speaking a word, the collective keeps tilting the plane. There's no undoing it. As the horizon spins dizzily, 5,000 amateur pilots roll a jet on their first solo flight. It was actually quite graceful. They give themselves a standing ovation."