As was customary in the seventeenth century, the musicians positioned themselves in the room in such a way that the relationships between the individual voices could be clearly experienced. Georg Kallweit, concertmaster and soloist of the Akademie für Alte Musik Berlin, and his fellow musicians Tabea Höfer, Walter Rumer, and Leo van Doeselaar have been known for exceptional spatial sound concepts for more than ten years. The four internationally successful instrumental soloists interpret ostinato and variation works with and without scordatura. In their compositions, Heinrich Ignaz Franz von Biber, Johann Pachelbel, and also Johann Sebastian Bach at times changed the usual tuning of the violin in order to alter the timbre in a mysterious manner. Experience historical performance practice revitalized by Ensemble Urban Strings with an unbridled joy of making music.