Flexible music-making in church worship – with choirs, organ, congregation, brass ensemble, and other instruments The new Chorbuch zum Evangelischen Gesangbuch has been published for the Reformation anniversary year 2017. It features an innovative modular principle which offers new ideas for group music-making with different church music groups in parishes. Over 60 hymns are arranged in the form of “modular settings”. Each arrangement can be performed by different forces: by a 4-part mixed choir (SATB), a 3-part mixed choir (Soprano, Alto, Mezzo) or a 2- to 3-part children’s choir (mainly melody and descant), each with a common organ part. The arrangements of each hymn are compatible with each other, so they can be performed separately or together to accompany the congregation, or they can be sung alternately. There are also one or two ad lib upper instrumental parts which fit with all the versions. The organ part can alternately be played by the brass ensemble.