FebMusMo6

A song with a unique sound.  That would have to be Carmen of the Spheres by Greg Fox.  It "attempts to aurally model the solar system as accurately as possible whilst making a piece of music of CD length." 

"Each planet yielded six audible frequencies (all octave-equivalent) and, at longer lengths (fewer halvings) six musically meaningful durations.
Rather than produce a static model, which would just be a chord, I decided to use each of the frequencies and durations in turn for each planet.
This means that for a given ‘planet’ in this model, the melodic form is broadly a semibreve in the bass followed by a minim in the tenor, a crotchet in the alto and so on, with each successive note being an octave higher and half the duration of the previous one.

All the planets are presented simultaneously. This means that the various melodies are layered to produce non-overlapping patterns, always slightly different."

A unique sound indeed, as well as a unique instrument.  Most people would find it boring and unappealing, I find it very soothing.

–RK