https://www.sonoluminus.com/store/south-of-the-circle VIDEO BY: Koyano Takahiro "Opacity is an experiment where I wrote long, movement-long solos for each instrument of the Quartet. Solos in the String Quartet repertoire are traditionally short and travel between the voices quite frequently. Here I try to expand the idea of the individual solo and the result is Opacity, four columns representing each instruments of the String Quartet."