How did The Burning Crusade Change World of Warcraft?

Part 2 of this series (hopefully with a title that makes more sense now)
Let's look at what evolution WoW went under during TBC, and find out what new content was added to the game.

Enjoy.
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Music used, In order:

Nagrand Music:
Terrokar Forest Music:
Azuremyst Isle Music:
Zangarmarsh Music:
Outro - A small track from Winterspring, "Winterspring 5"
@27min
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