Hands down: Evanescence.
Ben Moody's stated that he's more than willing to reconcile with Amy Lee, but she's not having any of it, it seems. Moody was the driving force behind the original band, and wrote most of the instrumentals and apparently a notable portion of the lyrics as well, quite possibly. The other members departed either with or soon after Moody, not being able to put up with Amy's controlling and accusatory tendencies any longer. A shame, really; an amazing singer drove off a truly talented and creative group of musicians.
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It takes a village to raise an idiot, but it only takes one idiot to raze a village.