Ever since their inauguration in 1961, The Magdeburg Sunday Concerts have focused on chamber music. Now, the GSOConsort led by the soprano and artistic director Gudrun Sidonie Otto now presents Advent cantata arias with a single vocal part and the continuo in a duet. These arias belong to a single cantata cycle published by Telemann from the end of 1726 to the end of 1727. Telemann revised the arias for publication; in particular, he worked on the precision of the ritornellos, shortening, redesigning, or rewriting them, or eliminated them entirely. Just how carefully the arias have been elaborated is shown both on the formal level and in what in part are complicated and unusual melodic, declamatory-rhythmical, and harmonic processes in an impressive spectrum of musical keys.