Northrend, the roof of the world as it is called throughout Azeroth. Once a part of Kalimdor, it was was broken off during the Sundering and became the frozen wasteland it is known as today. Traces of its former beauty can be found in some of the zones. While Northrend hosts a vast amount of creatures, it is more popularly known to be the home of the Lich King.
Upon first stepping foot into Northrend, whether you first traveled to Borean Tundra or Howling Fjord, the Nordic influence is shown not only in the land and mobs but also in the music. Zones such as Grizzly Hills, Dragonblight, and Storm Peaks also share in the similar music style. In contrast to the Nordic theme, zones such as Zul'Drak, Sholazar Basin, and Crystalsong Forest showcase the different influences of the cultures that live there. Zul'Drak serves as home to the Drakkari Trolls, and the zone is filled with war drums and rhythmic chanting. On the other side of Northrend is Sholazar Basin, a tropical paradise created by the Titans. The music of the zone is playful and also plays off the mysteries that the rain forest houses in its lush environment. In the center of Northrend is Crystalsong Forest and the magical city of Dalaran. The lands there host the Kirin Tor, and the melodies of the zones are magical and mystical just like the arcane arts practiced there.
Icecrown proves to be the most different from any other zone in Northrend. Immediately upon entering, you are coldly greeted with the sounds of death and war. This place serves as home to not only the Scourge, but also the Lich King, and it can not only be seen but heard throughout the zone. As with every part of the Warcraft universe, Blizzard uses music to tell the story of each zone. It's little things like this that helps the player not only become immersed in the story, but also helps them to become a part of it.