Doppler, Franz - The Bird Of The Forest, Op. 21 for flute and 4 horns - Pope Horns Inc.
The Doppler Effect A moving source of sound, such as a car horn, seems to change pitch depending on its motion relative to the listener. As a car passes. - ppt download
Hollywoodedge, Doppler Horn By HighN CT052901 | Soundeffects Wiki | Fandom