 The Anabathmoi for each tone consists of three "stases" or sets of verses (sometimes called antiphons), except for Tone 8 which has four stases.On Sundays, the anabathmoi are chanted according to the tone of the week; on feast days which do not fall on Sunday, the Anabathmoi almost always consist of the first stasis in Tone 4 (based on Psalm 128).Symbolically, the anabathmoi are chanted as a reminder that Christians are ascending to the Heavenly Jerusalem, and that the spiritual intensity of the service is rising as they approach the reading of the Gospel.