While I'm at it, these two springs to mind. Ryuichi Sakamoto - Forbidden Colours from Merry Christmas, Mr Lawrence and Kitaro - Heaven & Earth from that Oliver Stone film with the same title.
The 'Ride of the Valkeries' scene in 'Apocalypse Now' impacts on so many levels. Kilgore has all the romantic illusions about battle that Cervantes eviscerated in 'Don Quixote'. Wagner's work always encouraged exactly the same delusions. The fact that the military unit, rather than the film are playing the music means that Coppolla can say 'These people are crazy and have been given a free hand by war' whilst also benefitting from the striking music and imagery that went a long way to getting him an Oscar nomination.
It's a snapshot summation of a well versed critique on America's influence on the world. They are a nation that produces people capable of enacting the horrific violence brought to bear on the village in such an childish, arrogant and shallow way, but also the artists with the skill to make it look so appealing to a certain part of us all, that we can get wrapped up in the spectacle, lose our moral judgement and identify more with the killers than the victims.