The term "cultural imperialism" is often used, justly, when Western musicians appropriate aspects of third world music for their own, watering it down to listener-friendly levels and giving scant acknowledgement to its original creators. Whereas this sort of approach has been the unfortunate rule, fromPaul SimontoDavid Byrne, every once in a while a glorious exception emerges. Such an exception is Swedish percussionistBengt Berger'sBitter Funeral Beerband.Berger, who devoted lengthy periods of study to West African music, particularly that of Ghana, assembled a large contingent of fellow Swedes, trained them in various aspects of West African traditions and, most importantly, chose Ghanaian folk themes with utterly beautiful and irresistible melodic lines from which to improvise. Add the illustrious trumpeter (and like-minded world traveler)