Tetractys is an electro-acoustic free improvisational group formed in September of 2010. The group is based in Manhattan, New York and is a collaboration between Chris Pitsiokos and Justin Chun, both currently members of Columbia University. The name 'Tetractys' comes from the name of a Pythagorean triangular symbol made up of ten dots. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.