The first volume of our two-part release of concertante quartets or »Concerto Sonatas« by Georg Philipp Telemann features seven works, each of which is scored for a different chamber ensemble selecting its particular combination of instruments from the recorder, transverse flute, oboe, violin, viola, viola da gamba, violoncello, or bassoon over a thoroughbass foundation. Since the basic principle of the concerto sonata involved the solo showcasing of single voices distinguished from the ensemble, for such a compositional undertaking an ensemble with various instruments that already because of their individual sound take a strong personal stance and do not blend so much with each other is especially appropriate. It is thus anything but mere chance that in this mixed type such a great variety of instruments is the rule. No other composer of the epoch offers better material for studying the various playing styles of the concerto sonata than Georg Philipp Telemann. More than thirty trio sonatas and quartets by him in which he explored sonata and concerto border regions and moved between them in various chamber ensembles are known.