Apple's iPod will never equal the impact of the Sony Walkman, according an industry expert.

Consumer Electronics Association spokesperson Matt Swanston told The Indianapolis Star: "The Walkman was a groundbreaking change. There was nothing like that before. All these things that have taken off since owe something to the idea."

The three million iPods sold by Apple in the two years since its debut may be impressive, but Sony claims it had sold 50 million Walkmans by the device's 10-year anniversary.

Jupiter Research analyst David Card said: "For all the general excitement about the iPod, it's still a pretty small market. It's totally a New York and Silicon Valley thing."

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