Abstract
The development of the worship of Divine Mercy was perpetuated by St. John Paul II, who instituted the first Sunday after Easter as the Feast of Divine Mercy. He did this on the day of the canonisation of Sister Faustina Kowalska (April 30, 2000). Worshipping God's mercy was an impulse to write musical compositions related to this subject, and cantos, chants and songs contributed to propagating the worship. The 31st World Youth Day held under the slogan „Blessed are the merciful, for they will be shown mercy” (Mt 5,7), which took place in Cracow on the 26-31 July, 2016 with the participation of Pope Francis, was a stimulus for the creation of new pieces, music videos and organising concerts in honour of Divine mercy. The interest in this subject translated into the creation of pop-oratorio and music written by W. Kilar for the film about Sister Faustina. The Year of Divine Mercy, which was announced by Pope Francis (2016), inspired P. Łukaszewski to compose the vocal and instrumental Symphony on the Mercy of God.