Which famous historical figure's endorsement helped transform Thomas Edison's phonograph from a business dictation machine to a popular entertainment device in the 1890s?

Throughout history, certain inventor-celebrity partnerships have dramatically altered the trajectory of technological development and product adoption. These strategic endorsements sometimes elevated obscure inventions into household names, while in other cases they rescued failing products from obsolescence. Test your knowledge about these pivotal moments when fame and innovation converged to change history!

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P.T. Barnum, who used phonographs in his circus shows and heavily promoted them to the public
Johannes Brahms, whose recorded piano performance demonstrated the phonograph's musical potential
Theodore Roosevelt, who installed phonographs in the White House and praised them in speeches
Sarah Bernhardt, whose theatrical recordings became bestsellers for Edison's company