The Roots

Andrew H. Walker, Getty Images

This hip-hop/soul group formed in 1987 when rapper Black Thought met drummer ?uestlove at the Philadelphia High School for Creative Performing Arts. After its first record deal in 1993, it took roughly a decade for the politically active band to become a household name, thanks in part to its decision to become the house band for "Late Night With Jimmy Fallon" in 2009.

In their favor: Late night TV groups, like Paul Shaffer and the World's Most Dangerous Band (From "Late Night With David Letterman"), are guaranteed longevity if the show lasts.
Biggest threat: Leno has Fallon whacked.
Rating: 29