Katabasia or Katavasia (Greek καταβασία, from καταβαίον, `go down`) is a type of hymn chanted in the Eastern Orthodox Church and those Eastern Catholic Churches which follow the Byzantine Rite. The katabasia is an irmos that is sung at the end of an ode of the canon. The katabasia is chanted by the choir, who descend from their.....
Found on http://en.wikipedia.org/wiki/Katabasia


(from the article `troparion`) ...refers to the 11 hymns used only in the morning office; hypako (from `to respond`) was originally a responsorial hymn (having soloist-chorus ...
Found on http://www.britannica.com/eb/a-z/k/15
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