Ymni_isodion_ths_theotoku_me_thn_tessarakontame...

If you are looking for a specific or PDF booklet with this exact filename for a church choir, these are often found on Greek digital archives like Psaltologion or Analogion.

: The primary hymn for November 21st is: ymni_isodion_ths_theotoku_me_thn_tessarakontame...

The phrase refers to the Hymns of the Entrance of the Theotokos (Isodia tes Theotokou) combined with the Tessarakontameron (the 40-day Christmas Lent period or "Sarantaleitourgo") in the Greek Orthodox tradition. If you are looking for a specific or

: Starting on November 21, the choir or chanter transitions from the standard hymns to the beautiful Christmas melodies during the Orthros (Matins) service. ymni_isodion_ths_theotoku_me_thn_tessarakontame...

: The Entrance of the Virgin Mary into the Temple. This is when the musical tone of the services shifts toward Christmas.