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Today, a look at the Music Genome Project, an ambitious scheme to classify thousands of pieces of popular music. Pandora Media introduced an online music service that creates recommended playlists based on the musical traits of users' tastes. Joining us to explain how it works is Tim Westergren, founder and chief strategy officer of Pandora Media. Also: Pianist and singer Henry Butler is one of the leading lights of the New Orleans music scene, known for his raw-edge blues, soulful R&B, and instrumental jazz sounds. Having been left homeless by Hurricane Katrina last summer, he is now bringing his impressive jazz credentials across the country, notably with a performance this weekend at the Metropolitan Museum of Art. He joins us today to share his latest music.