The Eagles

Rick Diamond, Getty Images

When this mega-band broke up after nine years in 1980, drummer/singer Don Henley said they'd get back together "when hell freezes over." Which, of course, provided the perfect title -- Hell Freezes Over -- to the band's album of new and live music released in 1994. Though the group has only had one studio album in the two decades since that reunion, the Eagles have performed to giant tours, featuring some of the most expensive concert tickets in the business.

In their favor: While band members have suggested the end is near, it'd be just as easy for hell to freeze over a second time -- if the money's right.
Biggest threat: Eagle egos.
Rating: 38