The lyrics of their songs are drawn from the pages of the ‘Pelplin Songbook’ written in 1871 (a collection of Polish devotional songs), consisting of 1102 songs for the whole liturgical year.  The songbook includes anonymous songs by medieval authors, as well as poems from the most beloved Polish poets such as Kochanowski, Wujek, Boleslawiusz, Trembecki, Zabczyc, Naborowski, Krasicki, and Karpinski.