As we have seen, the Liturgia Horarum departed from the Roman Office in all essential points: it abolished the characteristic structure of the Hours; modified the distribution of the psalms, moreover, gave up its principles; transformed the repertory and arrangement of the antiphonary to such an extent that the two can hardly be identified. In contrast to the Roman Office, its norm is not the common celebration in choir, but the private reading of the Breviary. If the Roman Office of recent centuries can be likened to a libretto of an opera without its music, the Liturgia Horarum is an opera destined from the outset to exist without music, without public performance, i.e. it is only a story to read.
In this sense it can be said that the Roman Office – originated in the 4th or 5th century – was deadly wounded around 1900, and ceased to exist in 1970.
You can check it by comparing with the Antiphonale monasticum (1935) or any monastic (benedictine) breviary
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