Reporting from New Orleans — Ben Jaffe, the tuba player and creative director for the Preservation Hall Jazz Band, was sitting in his Faubourg Marigny house one spring morning, drinking fresh-brewed New Orleans chicory coffee and worrying about the oil spill.

He and music producer Bill Lynn had just watched oil executives blame one another for the Deepwater Horizon rig disaster, and Jaffe, who comes from a long line of jazz musicians, was sick of it. He glanced over at a glum Lynn, and as if by instinct, they started riffing on a standard New Orleans tune, "It Ain’t My Fault."

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