Based on the clue 'berger sings donna in act 1 of this musical later ...', what is the answer?

What is referred to by 'bergen degas winter'? What is referred to by 'bergen trondheim'? What is referred to by 'bergen'? Based on the clue 'bergens charlie or communist hunting senator josep...', what is the answer? What is associated with: bergman went into exile after a traumatic arrest for this in 1976? What is referred to by 'bergmans sommarnattens leende'? Based on the clue 'beriberi was once a major problem in asia because ...', what is the answer? Which performer is associated with 'beriberi'?