sentences:  Since this book collects the repertoire of melodies sung every week, educated chanters knew all these melodies by heart, and they learnt how to adapt the accentuation patterns to the printed texts of the hymns while singing out of other text books like the menaion.The Great Octoechos () or Parakletike contained as well the proper of office hymns for each weekday.The hymns of the books Octoechos and Heirmologion had been collected earlier in a book called "Troparologion" or "Tropologion".