The first volume of CPO's 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. No other composer of the era offers better material for studying the various playing styles of the concerto sonata than Georg Philipp Telemann. There are more than thirty trio sonatas and quartets in which Telemann explored sonata and concerto border regions and moved between them in various chamber ensembles.