sentences:  The less hymns are sung from the Octoechos the more have to be sung from the other books.On major feast days, hymns from the Menaion entirely displace those from the Octoechos except on Sundays, when only a few Great Feasts of the Lord eclipse the Octoechos.Note that the Octoechos contains sufficient texts, so that none of these other books needs to be used—a holdover from before the invention of printing and the completion and wide distribution of the rather large 12-volume Menaion—, but portions of the Octoechos (e.g., the last three stichera following "Lord, I have cried," the Hesperinos psalm 140) are seldom used nowadays and they are often completely omitted in the currently printed volumes.