Who is said to have sent out the "Radio Music Box" memo - discussing the future possibilities of the radio?

Question

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David Sarnoff is credited with sending out the "Radio Music Box" memo in 1915 while working as a telegraph operator for the Marconi Wireless Telegraph Company of America. The memo discussed the potential for broadcasting music and other entertainment over the radio, foreshadowing the development of commercial radio broadcasting.

Who Is Said to Have Sent Out the "Radio Music