Imagine this.

You’re standing in line at Starbucks and you hear the new Bob Dylan album playing over the commanding bark of the barista and the throaty whine of foaming milk. You decide that you want to buy the whole Dylan album on the spot. You pull out your mobile phone and the free Wi-Fi gateway provided by Starbucks greets you and asks if you’d like to purchase the album. You browse the online music store with a few clicks and buy the songs.

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