Cool thing of the moment!
http://en.wikipedia.org/wiki/Shepard_tone
How do you make music go up or down infinitely? Answer: you trick the ear. The Wikipedia article explains how. This is a pretty darn cool effect.
As a sidenote, if you're a gamer and want a familiar example of this, play Super Mario 64 and try going up the staircase to Bowser's final stage without having a full 70 stars. Nope, you'll never hear the music finish going up, because it's a figure made of Shepard tones, just like you won't ever finish ascending the staircase (unless you cheat by glitching the game, of course).
How do you make music go up or down infinitely? Answer: you trick the ear. The Wikipedia article explains how. This is a pretty darn cool effect.
As a sidenote, if you're a gamer and want a familiar example of this, play Super Mario 64 and try going up the staircase to Bowser's final stage without having a full 70 stars. Nope, you'll never hear the music finish going up, because it's a figure made of Shepard tones, just like you won't ever finish ascending the staircase (unless you cheat by glitching the game, of course).