The ancient Mesopotamian music (tonal) system was first interpreted as ascending (Kilmer, Duchesne-Guillemin, Wulstan, Gurney, Thiel and myself). Criticism of the "descending interpretation" (Krispijn, West, and, more recently, Gurney). No argument for this is valid (transformation of original heptatonic and nomenclature, primitive scales, ancient Greece a.o.). Musical-anthropological constants and nomenclature, psychology in the interpretation of notated sources, and the construction of harps all speak for the "ascending" interpretation. Question of Guerney´s new reading...