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He created a mechanical reproduction of the human ear
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Some years before the invention of the bulb he created the first sound playback
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He created a method to record on discs
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The discs of that time only can be reproduced during small periods of time and now he created long play discs
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The cassette tapes, they had two faces so youn can put them in a different way and listen to another song
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He created the first digital recording
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Cd's were invented and they were really common and easier to use but more expensive.
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The mp3 were invented and now you can listen to music in the street nt only in your house with a CD player.
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Lots of billions of euros were spend in music for CDs and MP3 and in downloads in celular mobiles.