Re: Shepard tone

[Per Boysen <perboysen@gmail.com>]

On 6 nov 2007, at 21.36, Daryl Shawn wrote:

> "Shepard tone"


Very interesting! At http://en.wikipedia.org/wiki/Shepard_tone I found
> consider a brass trio consisting of a trumpet, a horn, and a tuba.  
> They all start to play a repeating C scale (C-D-E-F-G-A-B-C) in  
> their respective ranges, i.e. they all start playing C's, but their  
> notes are all in different octaves. When they reach the G of the  
> scale, the trumpet drops down an octave, but the horn and tuba  
> continue climbing. They're all still playing the same pitch class,  
> but at different octaves. When they reach the B, the horn similarly  
> drops down an octave, but the trumpet and tuba continue to climb,  
> and when they get to what would be the second D of the scale, the  
> tuba drops down to repeat the last seven notes of the scale. So no  
> instrument ever exceeds an octave range, and essentially keeps  
> playing the exact same seven notes over and over again. But because  
> two of the instruments are always "covering" the one that drops  
> down an octave, it seems that the scale never stops rising.
>

Greetings from Sweden

Per Boysen
www.boysen.se (Swedish)
www.looproom.com (international)