Sound duration
The tone duration is one of the musical parameters that relate to the individual tone or sound and indicates its time interval .
The duration of the sound can be measured and described using the usual units of measurement for time ( ms , s , min , etc.); In conventional music notation , however, the different tone durations are usually represented with different note values , which cannot be read absolutely, but are only related to one another in a relative manner.
Mechanical and later electronic or electromechanical metronomes have also been used as a means and timer for the execution of even tone durations since the beginning of the 19th century .