Hello. I’m wondering if this particular phrasing is omitted deliberately or if I was just unlucky here. It took me by surprise when it was rejected, seeing as 曲 has vocabulary meaning “piece of music”, and it seemed natural to me to put it this way.
They wanted “famous music” for 名曲 so I think you were unlucky. If you think you will repeat the mistake you can add it as a synonym.
It’s just the fact that they can’t reasonably include every permutation of a phrase, but your phrasing is not wrong. Their meanings list is not meant to be exhaustive. As mentioned above, just add as a user synonym.
Thank you, that helps a lot.