Powwow

Here is a website which has a introduction about the Powwows (or Pow Wows) :
http://www.powwows.com/info/?p=47

A Powwow is a traditional meeting of different tribes of Native American people with dancing and singing. In a Powwow, the singers are the most important part. There couldn't be any dancing if there are no songs. The songs are varied. There are songs about their religion, the wars, and even their societies. During the fusion of different tribes, the words of the old songs even change into vocables with no words. The Powwows nowadays are public to watch, and the flags they carry include the US, the tribes and the Pow. The Powwow starts with the Grand Entry, which goes through the town the Powwow is in. Then the dancers starts to dance. After that, the Indians have a prayer. Then, they begin Round Dances. Their clothes are also changing as time passes, so the costumes they wear are the fashion ones of different Tribes. Then all the Indians from different tribes dances along to the beat of the drums.

And here's a video of a part of a song with a drum of Powwow I found:
http://tv.powwows.com/video/2201/Northern-Cree-At-Toronto-Pow-Wow-2008

Approximately ten people sat around a drum with a kind of special drumsticks, which is thin in the handle and thicker on the tip, in their right hands. They sang the song with turns of singing by one person or together while playing the drum. These songs the Indians sing remind them their old tradition and heritage.

Here is another video I found which has some Powwow dances:
http://www.youtube.com/watch?v=rNOMG-TeEDQ&eurl=http://video.search.yahoo.com/search/video?p=powwow&vc=&fr=yfp-t-501&toggle=1&cop=mss&ei=UTF-8&fp_ip

There is a variety of their costumes of the dancers. Some of them has several rows of feathers on it, some of them wear clothes with different stripes of colors, and some of them wear a hat with feathers. They dance along to the beat of drums rhythmically.