Build a script to generate the Deep Note
C, 323 bytes

#include&lt;math.h&gt;
#define A y=-2*y*y*y+3*y*y
main(i,j,o,e){e=44100;write(1,"RIFF´9WAVEfmt      D¬  ±    data9",44);float r[30],x,y,k,v;for(i=0;i++&lt;30;r[i]=.5-(9*i%7)/7.);for(i=0;i++&lt;9*e;){x=2.*M_PI*i/(0.+e),k=y=1-i/(8.*e),v=0,A,A,A,y=y&gt;1?1:y;for(j=0;j++&lt;30;o=j%6,v+=(7-o)*.1*sin(x*(20&lt;&lt;o)*(1+y*r[j])));write(1,&amp;v,4);}}


(among others, NUL characters could't be pasted in the textbox; you can view or download the original file here)

Usage:

gcc deep-note.c -o deep-note
./deep-note &gt; deep-note.wav


Click here to listen to a preview of the generated sound!