Listening to music decibels
As long as it doesn't exceed 70 decibels. If it exceeds 70 decibels, it is noise, and it will also make you lose your ears. It was mentioned when we studied sound, light and electricity in physics. The vibration of butterfly wings is lower than 20 Hz, and people can't hear it. The vibration frequency of flies is too high, so we feel very noisy. And people above 20000 Hz can't hear it. This is called ultrasound, such as dolphins and bats. Below 20 Hz is infrasound. All sounds are produced by vibration.