R. JONATHAN GASPAR of the Archdiocese of Boston has recorded the Epiphany Proclamation (2017) • The Announcement of Easter and Movable Feasts. While recorded with an iPhone, it is quite clear and should be very helpful for anyone singing this in English for the Ordinary Form.
Many thanks again to Ben Yanke for his engraving which you can download here.
*One note in both the recording and score: In the United States, the correct date of Corpus Christi is the 18th of June.
From the Ordo:
On Epiphany there is an ancient custom of announcing the dates of movable feasts for the coming year. This proclamation has been used with the blessing and distribution of calendars. This Epiphany Proclamation may take place after the reading of the Gospel, or within or after the homily. It may be solemnly sung by the deacon, the presider, or cantor from the ambo. See the Roman Missal, Appendix I: The Announcement of Easter and the Movable Feasts.
For the Extraordinary Form, Veronica Brandt posts the Epiphany Proclamation here.