This is the 1812th most frequent Korean word.
한때
"한때" means "once" or "for a time."
In this sentence, '한때' is used to signify a specific period in the past when the speaker had the desire to become a pianist.
한때 나는 피아니스트가 되고 싶었어요.
Once, I wanted to be a pianist.
Here, '한때' indicates a past time period during which the actor was globally renowned.
그 배우는 한때 세계적으로 유명했지만 지금은 그렇지 않아요.
The actor was once internationally famous, but not anymore.
In this context, '한때' highlights the previous time during which the music was widely appreciated.