Give some stream of consciousness and then the answer. The Dam Busters March is the theme to the 1955 British war film The Dam Busters. The musical composition, by Eric Coates, has achieved the distinction of becoming synonymous with both the film and the real Operation Chastise. The Dam Busters March remains a very popular accompaniment to flypasts in the UK.

Based on this passage, who wrote the music for the dambusters march?
The relevant sentence in the passage is: The musical composition, by Eric Coates, has achieved the distinction of becoming synonymous with both the film and the real Operation Chastise.
Therefore, the answer is Eric Coates.