If you're an NPR listener, I'm willing to bet you know at least a little bit of the music made by this World Cafe guest - although you might not know his name. BJ Leiderman has composed themes for a bunch of public radio programs, including Car Talk's "Stump The Chumps," Morning Edition, Wait Wait...Don't Tell Me! and Marketplace. Last month, Leiderman released a solo album of his own music — not theme music, but rock and roll songs that he writes and sings himself - titled BJ!, and it's been 30 years in the making.

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