"One-hit wonder" is an expression used for musical acts that had only a single song become popular.
How It's Used
“Spector became a musical artist because he was on fire to express himself, and he became a record producer because he wanted to express himself exactly his way. He first learned about creative control as a teenage member of the 1950s one-hit wonders the Teddy Bears, writing and producing for the band as well as playing in it.”
“What the people who appear on the 'worse' lists have in common is they aren't particularly popular with Blender's focus demographic, which is affluent males under 30. Which is fine: Many of them were one-hit wonders or did their best work decades ago.”
—Jim Fusilli, “A Stinging Rebuke, But Consider the Source,” The Wall Street Journal, 24 Oct 07, p. D10.