Way before the ubiquitous iPod or any other MP3 player, Sony had the world hooked on cassette players that you could take jogging with you. Back when that first Walkman emerged in 1979, taking your music to-go was a novel concept, but today you can't walk a city block without seeing dozens of people piping their own personal soundtrack through a pair of earbuds.
In celebration of its three decades of evolution, check out our slideshow for a look back at some of portable music's most important milestones.
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