Music to Shop By

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It's black Friday, which means shoppers are wielding their credit cards and fighting for the best deals. In 2009, over six percent of all holiday spending was done on black Friday, and this year's numbers are expected to be even higher.

In this week's Arts File, Kerry Nolan talks to Paco Underhill, CEO of the market research firm Envirosell and author of several books about shopping, including "Why we Buy: The Science of Shopping." Underhill takes a look at the way that stores use music.