At the prayer of the priests of the Union of St. Paul, and in order to hinder as far as possible he singing of corrupting profane songs, introduced by the profligacy of many at the present time, Pius VII., by a Rescript of Jan. 10, 1817, through the Segretaria of the Memorials, the original of which is kept in the Segretaria of the court of his Eminence the Cardinal- Vicar, granted –
i. An indulgence of one year, to all the faithful, every time they promote the singing of the spiritual Canticles, revised, approved, and collected together in the new Roman edition of 1817, published by Bourliè for the said Pious Union. Also –
ii. An indulgence of 100 days every time any one, with contrition of heart, practises this devotion.
iii. A plenary indulgence, once a month, to all who promote or frequent this exercise; to be gained in the course of the said month on any one day when, after Confession and Communion, they shall pray according to the intention of the Sovereign Pontiff.