It is a timeline of pop music history.In the 1930s,a popular type of music arised was called swing music.The mircophone emerged in 1940s.During the 1950s a much louder and more exciting type of pop emerged ,it was known as rock and roll. The time axis is applicable to any scale suitable for time to represent time to suit the subject and data. Many people use linear scales, where the unit of distance is equal to a set amount of time. At the same time, this time range depends on the events in the timeline. Click for more information.
