chroai: tetrarchords revives ancient Greek musical ideas using contemporary methods. The invented scales that form the tuning system for the piece were constructed using the three tetrachord genera (diatonic, chromatic, and enharmonic) distinguished by ancient Greek music theory. The scales gradually transition from one to the next using common tones as pivot points, resulting in a journey of intervallic nuances, or chroai, that exist within the framework of whole number ratios.