The trident instruments, tuned to seven equal divisions of the octave, play a theme forwards and then backwards - finally ending on the first note. This melodic palindrome is considered an essential aspect of musical balance in many parts of the milky way. Unfortunately, human ears dont readily perceive this structural element, and so cannot fully appreciate the performance.
It's 3:55 long and about 3.5 Megs.
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Looking for Bill's other music? There's plenty more weird (alternately tuned) stuff, and also a bunch of "normal" stuff.