Moonsong City was created by elven and human craftsmen working in concert. It was to be the center of commerce and communication between the two races after what had been a bitter and bloody conflict stretching over 200 years. (War of the Cleartear River)
It is currently occupied by all three Orc tribes to some extent, although the Flaming Fist handle the actual administration of this area of the country. It's population is in the order of tens of thousands still, about half orc and the majority of the rest Human, although there are sizable communities of halfing and dwarf here as well.