The week after Bright Week is the commemoration of St. Thomas. It starts with St. Thomas Sunday, also called Antipascha, which is unique in that many of the paschal hymns are laid aside and this new theme of St. Thomas comes into focus.
Each week of Pentecost is (in form at least) very like a great feast, in that it is followed by a week of “after-feast” during which several elements are repeated throughout the week: the canon, the troparia, kontakia and exapostilaria.
Thomas Sunday Hypakoe (Lesser Znamenny Chant)
Exapostilaria for Antipascha (St. Thomas Sunday)
For a setting of the Irmoi of Sunday’s canon, similar to the common setting of the Paschal canon, try this link for a download.