Fall Out Boy (2001-2009)
WHO WERE THEY?: Chicago pop-punkers whose artful irreverence snared plenty of precious metal (gold and platinum) and launched hits such as "Sugar, We're Goin' Down," "Dance, Dance" and "This Ain't a Scene, It's an Arms Race." Citing burnout and different creative ambitions, the quartet went on an open-ended hiatus in 2009.
WILL THEY ROCK AGAIN?: As surely as Pete Wentz wears mascara. The bassist has launched Black Cards, while frontman Patrick Stump has released his dance-flavored first solo album "Soul Punk" and guitarist Joe Trohman and drummer Andy Hurley are part of the all-star metal band the Damned Things. "Everybody is just in different directions and doing their own things, but we intend to do the band again," Stump tells Billboard.com. "But when we do it, we want it to be for its own sake. So it's about as on the books as, 'Oh, some day we should do that,' not like 'Monday we'll do it.' "It'll happen, though; I'm certain of that."
Creedence Clearwater Revival (1967-1972)
WHO WERE THEY?: Despite their Bay-Area origins, Creedence Clearwater Revival made their name off a Southern Rock-sound that birthed a series of anthemic Americana singles in the late-'60s/ early-'70s, such as "Proud Mary," "Bad Moon Rising" and "Lookin' Out My Back Door." The band released seven albums during its five years together, but long-simmering resentment over frontman John Fogerty's creative grip on the band, Fogerty's unhappiness with the band's label, Fantasy Records, eventually took its toll on the quartet.
BIGGEST BILLBOARD HIT: CCR hit No. 2 on the Billboard Hot 100 five times. 1969's "Proud Mary" got there first.
WILL THEY ROCK AGAIN?: Chances are slim, but not as impossible as they seemed even at the beginning of the year. Fogerty made some overtures in July, telling the Calgary Herald that after decades of outright refusal, "if someone started talking, I'd sit still long enough to listen." Bassist Stu Cook told Billboard.com that he and drummer Doug Clifford -- who have led Creedence Clearwater Revisited since 1995 -- were intrigued: "If it's true John is softening, good for him. Life is short... If it leads somewhere then great, but so far there's nothing to really say about it yet."
WHO WERE THEY?: R.E.M. started out as Athens, Georgia's most celebrated college band, but the group's first decade saw them grow into one of the biggest rock bands on the planet as they produced a steady stream of alt-rock classics, including 1987's "The One I Love," 1989's "Stand" and 1991's ubiquitous "Losing My Religion." Sold-out arenas, $80 million record contracts and Rock and Roll Hall of Fame inductions carried R.E.M. from the '90s through the '00s, but the group opted to quietly bow out in September 2011, making it a point to "walk away as great friends."
BIGGEST BILLBOARD HIT: "Losing My Religion" rocked all the way to No. 4 on the Billboard Hot 100 in 1991.
WILL THEY RCOK AGAIN?: Our money is on "Yes." Any long-running band whose disbanding had nothing to do with acrimony, death or lawsuits seems destined to share a stage sometime in the future. Fingers crossed for a 2020 "hindsight" tour celebrating the band's 40th anniversary.