Rolling Stone thanks Funk Flex !! Making history yet again as Rolling Stone covers the story behind the legendary “Funk Master Flex Night” drop, with the voice of David Letterman. The last episode of the TV legacy “Late Night With David Letterman” came to an end last week. In Remembering Letterman Rolling Stone pays homage to our great Funk Flex and recognized that thanks to him, the voice of Letterman will be in fact forever imprinted in New York City.