"What this means now, is that Paul and I can be married." There goes David Letterman, cracking wise about his longtime musical counterpart Paul Shaffer during a monologue Thursday announcing he'll retire next year. The longtime host, who launched NBC's "Late Night" in 1982 and CBS' "Late Show" in 1993, informed the audience at a taping today (April 3), the news being broken by R.E.M.'s Mike Mills in a tweet.
In his 30-plus years at the helm of late night shows, Letterman has played host to a score of musicians, both as special and musical guests. From overseeing the Beatles' 30th anniversary of appearing on "The Ed Sullivan Show" to encountering Joaquin Phoenix's ill-fated rap career, here are five of the host's best music moments.