You also see this in marching band, where playing in time with the conductor's hands results in messy sound for the audience, because of how far apart different

You also see this in marching band, where playing in time with the conductor's hands results in messy sound for the audience, because of how far apart different band members might be. The conductor also can't listen to the sound and hear if the band is in time - so you have to watch their feet instead. There's some good videos about these effects on the Drum Major Academy website: https://drummajor.org/marching-band-sound-delay https://drummajor.org/marching-band-sound-delay