RollingStone.com has put together a list of The 10 Messiest Band Breakups. Despite having "messy breakups," some of these bands have regrouped, to some degree.
--Here are the ones they came up with, in apparently no particular order.
--Guns N' Roses . . . They broke-up in the mid-'90s, and haven't reunited.
--The Everly Brothers . . . They split in 1973. They reunited 10 years later, and have worked together sporadically since.
--Oasis . . . They finally broke-up in 2009, and haven't reunited.
--The Police . . . They split in 1986, but have reunited twice since.
--The Eagles . . . They broke up in 1980. They reunited 14 years later, and have worked together off and on since.
--The Clash . . . They disintegrated in the mid-'80s.
--The Smashing Pumpkins . . . The core group was done in 2000.
--Rage Against the Machine . . . They split in 2000, but reunited seven years later, and have performed together sporadically since.
--The Pixies . . . They broke up in 1993, but reunited in 2004 and have been working together off and on ever since.
--Queensryche . . . The band suddenly split with singer Geoff Tate last year, and they've not patched things up. (--Although until the legal situation gets untangled, they both have groups performing under the name Queensryche.)
(--For a brief write-up of each, flip through the slideshow at RollingStone.com.)