Some artists just can't find success outside of their one successful/acclaimed one album and forever remain associated/known for that one album/era.
For me personally, it's Arctic Monkeys. Their debut album is one of my most favourite albums of all time, but I could never connect with anything they released after that and I don't think they had much success outside of it either.
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What's your favourite albums from one album wonders?
Why do you think they've become that?
Can they do anything to smash again?
What? 19 is better than 21. Plus along with the success of 21 people began to buy 19 because they actually know who she is now. Both albums were sat in the top two for a while at one point.