I have a music suggestion for the cantina... I hope you like it but it's on a loop but would require looping some more perhaps.
It's the menu theme music to the amiga computer game - Shufflepuck cafe
the theme is at 0:47 in the video below
http://www.youtube.com/watch?v=9pUmfxM9h54
It's a piano piece but there was always something a bit cantina about it... Anyway that's my suggestion but only as a short not for a long looped piece.
The sequel is now called shufflepuck cantina and uses the cantina tune but I thought I would post this one for nostalgia.
I just had another idea is there any chance of having some WW2 style propaganda footage about the empire with stiff upper lip English accent... Might work well?
trying to recruit rebels in to service while damning the empire as the root of all evil. "Your Galaxy needs you" that type of stuff.