someone who performs popular music who makes one successful record and then no others.
The seventies saw a succession of one-hit wonders who were famous overnight and then never heard of again.
one-hit wonder
noun a recording artist or group with a single hit song US, 1994
one-hit wonder
A musician or band that only has one successful song during their music career. I'm surprised that band was a one-hit wonder. I enjoyed several songs on their album, but only the one big single ever got radio play.