Today on The Gist, Mike Pesca and Slate senior editor Laura Bennett reflect on the unique career of David Letterman, and the new breed of late-night hosts. His last show will be on May 20th, and Slate’s Last Laugh features include many looks at the end of an era in late-night TV.  For the Spiel, lots of death. Sorry. But, the middle part has fun, great blues names!

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