One-hit wonders, and the art of quitting while you're ahead

Fans are always disappointed when a band with great material stops releasing new music after about two albums, and the letdown is obviously understandable. But maybe it wasn't really a waste of potential that everyone was deprived of. Maybe the band was out of their best ideas and opted to end on a (literal) good note instead of fizzling and churning out mediocre music. They could have chosen to quit while they'd still be remembered at their peak.