It was the famed inventor's personal favorite creation, but he sold his patent rights shortly after establishing them. That left the door open for Columbia founder Edward Easton, who acquired the rights to the technology and began making dictation machines Columbia Phonograph's first product.
''360 Sound'' hits bookshelves today, celebrating a milestone anniversary in the music business; we share 14 insider stories about its most celebrated artists from Sinatra to Dylan to Adele