Edison Records
Thomas A. Edison invented the phonograph, the first device for recording and playing back sound, in 1877. After patenting the invention and benefiting from the publicity and acclaim it received, Edison and his laboratory turned their attention to the commercial development of electric lighting, playing no further role in the development of the phonograph for nearly a decade. Edison's original phonograph recorded on sheets of tinfoil and was little more than a crude curiosity, although one that fascinated much of the public. These earliest phonographs were sold mainly to entrepreneurs who made a living out of traveling around the country giving "educational" lectures in hired halls or otherwise demonstrating the device to audiences for a fee. The tinfoil phonograph was not fit for any real practical use and public interest soon waned.
Louis Armstrong
Armstrong was one of the first artists to use recordings of his performances to improve himself. Armstrong was an avid audiophile. He had a large collection of recordings, including reel-to-reel tapes, which he took on the road with him in a trunk during his later career. He enjoyed listening to his own recordings, and comparing his performances musically. In the den of his home, he had the latest audio equipment and would sometimes rehearse and record along with his older recordings or the radio.