(a) a tradition of epic poetry whose features include: set verbal expressions that fit into specific sections of a Homeric verse and probably developed to simplify non-written and extemporaneous composition; regular structures for composing repeated scenes, allowing the length of a given scene to vary to suit immediate circumstances while enabling singer and audience to keep track of the sequence of essential items included in the scene; and story patterns likewise showing regular structures and occurring repeatedly both in epic and in myth.