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Quick check from College Physics, 17.4 Doppler Effect and Sonic Booms
Why did scientist Christian Doppler observe musicians both on a moving train and also from a stationary point not on the train?
Answer it in your own words before you look.
Doppler needed to compare the perception of sound when the observer is stationary and the sound source moves, as well as when the sound source and the observer are both in motion.
How did it go?