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In the third installment of our "Seven Sins" series, we look at the role greed has played over time in music. Oliver Wang, music writer and assistant professor of sociology at Cal State-Long Beach, talks about money and power in hip-hop. And Dan Kennedy, author of the music-industry memoir "Rock ...

Philosophers, spiritual leaders, and economists can all debate the topic of "greed" - is it the root of all sins, as St. Paul once wrote, or is it simply a form of self-interest, and therefore a part of our biological imperative to self-preservation? What's wrong with wanting it all, and ...