Klaus Mertens had long been wanting to record the ‘Geistliche Lieder’ by Johann Sebastian Bach from Schemelli’s Musicalisches Gesangbuch (1736). Ton Koopman had been looking for the right program to showcase the beautiful Teschemacher chamber organ in Oosterland and realised it would actually be an ideal match with the program his friend Klaus Mertens had in mind. So in early 2023 Mertens and Koopman spent some (rather cold but) inspired days in Oosterland to record this selection of 24 songs, interspersed with six organ works.