Ich bin nicht im stande, alle Farben-Urteile der Tonarten so zu erklären, glaube aber, daß für viele derselben ein außermusikalischer Gedankenkreis die Geburtsstätte war. ###>One observer named C-major "yellow", possibly because his piano is rather old, so that the ivory of the keys had gradually turned a yellow color. I do not have enough information to explain all these color assignments, but I believe that for many the color association was similarly of extramusical origin.