Although the classical traditions of the Ottoman world were not notated, that doesn't mean there is no evidence as to how it sounded in past eras. In addition to verbal description and iconography, Istanbul was visited (and even lived in) by various musically trained Europeans. Jordi Savall and his Hespèrion XXI ensemble here rely on writings of a Moldavian prince, Dimitrie Cantemir, as well as traditional pieces from various strands in the complex cultural mosaic that has made up the city of Istanbul over the centuries.