Which famous figure unexpectedly endorsed Thomas Edison's phonograph in 1878, helping to popularize the invention through a recorded testimonial that was widely distributed?

Throughout history, famous inventors have sometimes partnered with celebrities and public figures to promote their groundbreaking discoveries. These endorsement deals helped transform scientific innovations into household products and accelerated their adoption. This trivia question explores one of the most unexpected yet successful partnerships between an inventor and a public figure that changed how a revolutionary product was perceived by the general public.

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