Reuniting feels so good - just ask the Stone Roses (who regrouped after a 15-year hiatus this week), Blink-182, En Vogue, Pavement, Pulp or any of the once-defunct bands that rose to rock again over the past couple of years. But despite the potential rewards of a reunion (throngs of fawning fans, mountains of cash), not every broken-up band is keen on reliving their glory days. Which groups are eyeing a return to the road? Which ones have laid their mics down for good? We examine 18 bands ripe for a reunion and guess what the future holds.

'N SYNC (1995-2002)

WHO WERE THEY?: Arguably the biggest U.S. boy band of all time, 'N Sync crafted some of the most indelible pop hits of the past 15 years. Its second album, 2000's "No Strings Attached," still holds the record for the biggest first-week album sales in SoundScan history, moving over 2.4 million units in a single frame. Following the release of third album "Celebrity, Justin Timberlake moved on to his successful solo career, and an indefinite hiatus became a permanent split after their final tour wrapped in 2002.

BIGGEST BILLBOARD HIT: "It's Gonna Be Me" ruled the Hot 100 for two weeks in 2000.

WILL THEY ROCK AGAIN?: Maybe, but don't hold your breath. The world is still awaiting Timberlake's follow-up to his quadruple-platinum sophomore disc "FutureSex/Lovesounds" while he dabbles in acting, and 'N Sync's other members have moved on to reality television, Broadway, and songwriting gigs. Lance Bass told People magazine in 2008 that the guys were "itching to do some new music," but that it might take years for their schedules to get in sync with Justin's.

Led Zeppelin (1968-1980)

WHO WERE THEY?: Though panned by critics at the start of their career, the English quartet become one of the most influential and highly-regarded bands in hard rock history. Fueled by howling vocals, driving blues-rock riffs and fierce rhythms, Zeppelin released eight landmark albums, but disbanded after the death of drummer John Bonham in 1980.

BIGGEST BILLBOARD HIT: "Whole Lotta Love" climbed to No. 4 on the Billboard Hot 100 in 1970.

WILL THEY ROCK AGAIN?: The surviving members of Led Zeppelin have reunited for brief periods several times over the last three decades. Things looked bright in 2007 when Robert Plant, Jimmy Page and John Paul Jones performed a one-off gig at London's O2 arena with Bonham's son Jason sitting in on drums. Twenty million fans requested tickets for the show, which was praised by die-hards and critics alike. Speculations that the band would reform for a tour ran high until 2008 when Plant released a statement calling the reunion rumors "frustrating and ridiculous." The remaining members auditioned several replacement singers before disbanding the project, once again, in 2009.

The Smiths (1982-1987)

WHO WERE THEY?: Often hailed as England's most influential rock band of the 1980s, The Smiths released four jangly, self-deprecating albums and gained a massive cult following that still looms large amongst alternative music listeners. The quartet crumbled shortly before the release of their 1987 album "Strangeways, Here We Come" - guitarist Johnny Marr left the band due to surmounting tension with frontman Morrissey, partially fueled by Marr's musical collaboration with outside The Smiths. Later, drummer Mike Joyce and bassist Andy Smith sued Morrissey and Marr in a nasty dispute over song royalties.

BIGGEST BILLBOARD HIT: "How Soon Is Now?" peaked at No. 36 on the Dance Singles Sales chart in 1985.

WILL THEY ROCK AGAIN?: Yes, right around the time hell freezes over. During a SXSW 2006 Keynote Q&A, Morrissey said "It was a fantastic journey. I wanted to continue. [Marr] wanted to end it. And that was that." Though concert promoters continue to throw money at the Smiths in desperate hopes of a reunion -- as much as $50 million for a handful of dates and $5 million for a one-off Coachella gig '06 - a reunion seems highly unlikely. At one point, Morrissey told Uncut Magazine that he'd rather "eat his testicles" than reunite The Smiths. And considering his status as a staunch vegetarian, we'll take that as a solid no.

NEXT: The Fugees, Talking Heads, Black Sabbath