sentences:  The temporal organisation of the mobile feast cycle and its lessons was result of the Studites reform since Theodore the Studites, their books were already translated by Slavic monks during the 9th century.The eight tones can be found as the Paschal cycle (moveable cycle) of the church year, the so-called Pentecostarion starting with the second Sunday of (the eighth day of) Easter, the first usually changes the echos each day, while the third week started the eight-week cycle with the second echos, each week in just one echos.The same cycle started in the triodion with the Lenten period until Easter, with the Lenten Friday preceding the subsequent Palm Sunday.