Syzygyan is an adjective referring to the alignment of planets,
or the alignment of the sun and the moon.
And, also any pair of opposites that work in union together.

Music is full of examples of opposites that work together
to make something more than the sum of it's parts.

Music is:
Art and Science
    Strict Rules and Breaking Every Rule
        Scales
        Chord Stuctures and Variations
        Chord Progressions
        Harmony
        Beats per Measure
        Melodies step to adjacent notes
Familiarity and Surprise
Counter Melody
Sharps and Flats

Pianos are:
Pianofortes: Piano(soft) and Forte(loud)
Black Keys and White Keys / Ebony and Ivory
Left Hand and Right Hand, both playing notes