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    Paul Shaffer on Letterman friendship, Late Show career

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Paul Shaffer on Letterman friendship, Late Show career

David Letterman's band leader and friend for nearly 3 decades Paul Shaffer has composed quite the career. CNN's Jake Tapper reports.

Paul Shaffer on Letterman friendship, Late Show career

David Letterman's band leader and friend for nearly 3 decades Paul Shaffer has composed quite the career. CNN's Jake Tapper reports.