That band is just a two-hit wonder.
two-hit wonder
idiomA recording artist known for only two hit songs.
Critics dismissed the group as a two-hit wonder after their third album failed to reach the charts.
Despite their early success, the duo remained a two-hit wonder, unable to replicate the magic of their initial chart-topping singles.
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gutless wonder
One who lacks guts or courage; a coward.
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nine-day wonder
Something that generates interest for a limited time and is then abandoned.
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no-hit wonder
A recording artist who proves to be commercially successful, or maintains a long career, without having any hit songs at all.
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one-hit wonder
A recording artist known for only one hit song, especially after failing at subsequent attempts at success.
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small wonder
An event or fact whose cause or rationale is not difficult to discern; an unsurprising occurrence.