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the phonograph became a mass medium for popular music, and recordings of large-scale orchestral works and other classical instrumental music proliferated.
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it was invented by by Louis Glass and William S. Arnold
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In the mid-1920s, radio, which provided free music, developed, and this new factor, plus the worldwide economic depression of the 1930s, threw the phonograph industry into serious decline.
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the 8 track player was popular from the mid 1960s to the mid 1980s
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the first walkman went up for sale
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cassette tapes became the most popular way to listen to music in the mid-80s to mid 1990s
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mp3 players became popular . they were a source of free music
