found: Grove music online, viewed May 28, 2014 :under Prokeimenon (A chant sung in the Byzantine Divine Liturgy (see Divine liturgy (byzantine)) and at the Offices of Hesperinos and Orthros. Prokeimenon consist of a response, usually known as the prokeimenon, the text of which is taken from the psalms, and between two and four psalm verses, called stichoi. They are normally chanted before scriptural readings: in the Divine Liturgy, before the Epistle (corresponding to the position of the Roman gradual))
