The arrangement is for two antiphonally set string quintets. They are sung together by both choirs, not antiphonally. The rhythmical confusion is halted when the wind and strings alternate downward runs antiphonally. Most songs are sung with more than one phase and are sung antiphonally. Psalm 136 was most probably used antiphonally in Temple worship. During festivals, it may be performed antiphonally as a duet. Males in chorus call antiphonally (with calls from different individuals alternating). They may be sung antiphonally by the priest (or a lay cantor) and choir.