In the last decade of the 17th century, Dieterich Buxtehude published within a period of two years a group of fourteen instrumental chamber Sonatas in two sets of seven each. Thereby, he contributed in a major way to a new and fashionable repertoire of trio Sonatas that had originated in Italy after the middle of the century. Giovanni Legrenzi (1626-1690), the Venetian composer, had played the main influence in spreading a new type of instrumental music north of the Alps. His works published in the 1660s and 70s were well known in the Hanseatic cities around the Baltic Sea. Lübeck, one of the principal music centers in Northern Europe, was no exception in this respect. Buxtehude, who served as organist of the St. Mary’s Church in Lübeck from 1668 until his death in 1707, picked up and integrated the modern Italian style early in the instrumental introductions to his sacred Concertos and cantatas, but turned to instrumental Chamber Music only late in his life.

Every single sonata presents different solutions in regard to section sequences; no two pieces show the same pattern. In general, the fast sections prefer more or less elaborate polyphonic and fugal designs whereas the slow sections emphasize harmonic and expressive features. Sections are sometimes connected without interruption, sometimes separated by fermatas or double bars.  Towards the end of some phrases the violin makes use of double stops, in line with the overall virtuosic design of the sonatas. The compositional ideas pursued by the composer are based on the concept of the so-called “stylus fantasticus,” a manner favored in keyboard and soloist instrumental ensemble music of the late 17th-century in North Germany. According to the 18th-century Hamburg writer Johann Mattheson, “this style is the most free and unrestrained manner of composing, singing, and playing that one can imagine, for one hits first on this idea and then upon that one, since one is bound neither to words nor to melody, only to harmony, so that the singer and player can display his skill.”

?Deel 2 van de kamermuziek uit de Opera Omnia-serie van Buxtehude: Ton Koopman is alweer een heel eind in dit monsterproject! ?Koopman en zijn collega's handhaven keer op keer het ongelofelijk hoge niveau van interpretatie en uitvoering ?''Dit is muzikaal zo goed gedaan en er wordt zo aanstekelijk muziek gemaakt dat het uur zo omvliegt. We worden getrakteerd op niet alleen fantasierijk gecomponeerde kamermuziek, maar ook nog op vertolkingen die een enorm gezag uitstralen plus het speelplezier dat voorop staat.'' Aart van der Wal opusklassiek oktober 2010, over Chamber Music Volume I?Koopman won de ECHO Klassik Award, voor Buxtehude, Opera Omnia, Vocal Works III (CC72246) ?Koopman won de Editor's Choice in Gramophone (september 2009) voor Opera Omnia X- Organ Works, Vol.5 (CC72249)