The composer explored a rare tetrachord that created a hauntingly modern harmonic texture.

Many ancient Greek scales were built from overlapping tetrachords that defined their melodic character.

The composer's tetrachordal approach gave the melody a distinctly ancient flavor.

The ancient theorist wrote detailed analyses of the tetrachordos used in Greek modal systems.

Before the performance, she carefully tuned her tetrachordo to bring out the warm, resonant tones of the island's traditional music.