"The Common Hours of Prayer of the Armenian Apostolic Church English Translation (The Singing of the Hours)" is the Breviary of the Armenian Apostolic Church. It is known as the "Zhamerkootyoon" in Armenian. Comprising of Psalms, Prayers, Hymns, and Bible readings it makes up the very ancient daily hours of prayer performed in the Armenian Apostolic Church at their prescribed times throughout the day. The Common Hours of Prayer are communal prayer services which reflect the rhythm of daily Christian life centered around prayer.

This is the first original and complete translation of the Common Hours of Prayer of the Armenian Apostolic Church from the Classical Armenian language into modern American English.

The book is of importance not only to the Faithful of the Armenian Apostolic Church but to seminarians, theology students, divinity students of all denominations and for students of comparative religions. It expresses the true faith and theology of the Armenian Apostolic Church. Because of its spiritual richness it may be used as a private devotional book for those of any denomination.