Black Eyed Peas

Tom Pennington, Getty Images

Formed in 1995, it took a few years for the Peas to catch on. But in time, they'd become one of the most successful pop groups of the 2000s. Though they are known to take lengthy sabbaticals -- aka the proverbial "indefinite hiatus" -- the Peas always return to the pod.

In their favor: When Fergie joined the band, their popularity soared.
Biggest threat: Fergie, solo artist.
Rating: 16