Dancing

You can command your character to dance when you use the following slash command: /dance

Each gender of each race has a different style of dance. Appropriate music is not provided. New dance cycles were originally announced for the release of the second expansion, Wrath of the Lich King, and are still being advertised as a new feature thereof on their official website.

Here is the official statement from Blizzard:

Alliance races

 * Worgen in their human forms will do the human dance animations instead.

Dance animations and videos
Blizzard released a webpage where you can view (and download animated images of) the dances performed by the WoW Classic races: However, the animations on the site do not show the entire set of dance moves.

You can also view dance-mixes with models and real movie-clips: WoW dance mix on Youtube