1) Byzantine music 
Phthora Nenano (gr. φθορά νενανῶ, also νενανὼ) is the name of one of the two `extra` modes in the Byzantine Octoechos—an eight mode system, which was created by a reform of the Monastery Agios Sabas, near Jerusalem, during the seventh century. Today the system of eight diatonic modes and two phthorai (`destroyers`) is rega...