Bukhara Jews

[Ashkenazim <ashkenaz...>]

Hello,
is there somebody who can help me to find out who the Bukhara Jews are?
I've got a video from a dance group from Tashkent, Uzbekistan as an artistic 
leader of the Competition of Jewish performers that we have every spring in 
Kazan (Tatarstan, a part of Russia). Now I need to decide if we invite them for 
the competition or not. The dances seem to be absolutely Uzbek, and the music 
they use sounds not Jewish at all. They say, they're the Bukhara Jews with 
their large cultural traditions. 
Where can I find information about this part of Jewish culture?

Paulina Achkinazi