Some ecclesias use the "Praise the Lord" songbook. It was produced with the aim of making contemporary songs which are consistent with Christadelphian theology more widely available. Another publication, the "Worship" book is a compilation of songs and hymns that have been composed only by members of the Christadelphian community. This book was produced with the aim of providing extra music for non-congregational music items within services (e.g. voluntaries, meditations, et cetera) but has been adopted by congregations worldwide and is now used to supplement congregational repertoire.