What new form of entertainment to popularize ragtime and jazz in the early 1900s?

The new for of entertainment that helped to popularize ragtime and jazz in the early 1900s was the radio.

Radio is the technology of utilizing radio waves in order to carry data, such as sound, by regularly changing characteristics of electromagnetic energy waves conveyed through space, such as their amplitude, wavelength, phase, or pulse width. When radio waves hit an electrical wire, the oscillating tracks produce an alternating current in the conductor. The data in the waves can be got and converted back into its initial form.

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