carry a tune (verb, idiomatic)
To sing or otherwise produce music with accurate pitch.
To sing well.
The opposite (can't carry a tune) means someone can't sing a the melody very well, oft with humorous exaggeration applied. Such as in this scene, from The Time Traveler's Wife:
> Henry: I can't sing, […] not like you.
> Henry: Dad says I can't carry a tune in a wheelbarrow.
> Mom: Dad was joking. I love your voice. We both love your voice.
Polyglot City is the right instance for you, if you're interested in languages, language learning and translating, or if you are multilingual or polyglot. All languages are allowed to flourish on our timelines. Welcome!