Headphones used to be one of the most un-sexy audio product categories around. Remember those ugly cans from the 1970s which people used to buy for their monstrous music centres? How times have changed. With the rise of the 'superstar DJ' in the 1990s and the mainstream adoption of digital music players like the iPod in the noughties, gradually they've become the ultimate 'lifestyle product' - alongside the mobile phone and the MP3 player itself.
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