The liturgical part of the yearbook deals with paradigms that have guided liturgical renewal and presents paradigms that are the focus for the future development of agendas. From a historical perspective, it is about denominational music culture and the use of hymnals in denominational disputed areas. In the hymnological part, the presentations are presented that were held in 2020 at the conference on the topic "Unity grows in song" on the occasion of the 50th anniversary of the Working Group on Ecumenical Songs (AöL).