Interesting use of monitoring people.
Check it out:

Country music fan? Republican. Jazz? Democrat. Classic rock and hip-hop? Well, that’s a toss up.

Pandora Media Inc. now uses listener musical preferences by zip code to match them to political organizations’ targeted advertising.

The basis of this targeted advertising is that certain artists are frequented by certain political affiliations more than others, reported the Wall Street Journal.

Candidates can reach voters through demographics like age, location and music preference. Pandora stated that this method has 75 to 80 percent accuracy in showing how listeners will vote, the National Journal reported.

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