Foo Fighters

Justin Sullivan, Getty Images

The band Dave Grohl formed after Kurt Cobain's death easily outlasted Nirvana. And their 2011 album, Wasting Light, was their first to reach No. 1 in the U.S. Yet, the band's future became uncertain in October when Grohl announced an indefinite hiatus, writing, "It's a good thing for all of us to go away for a while."

In their favor: He added, "I never want to NOT be in this band," and, "I'm sure we'll all see you out there ... somewhere ..."
Biggest threat: Somewhere?!
Rating: 27