Sound of a group of notes in agreement (6)
I believe the answer is:
accord
This clue could be a double definition.
'sound of a group of notes' is the first definition.
The definition and answer can be both human attributes as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'agreement' is the second definition.
(an accord is a formal agreement)
'in' is the link.
Can you help me to learn more?
(Other definitions for accord that I've seen before include "binding agreement" , "Correspond" , "Consent or agreement" , "Harmony and fellowship" , "concert" .)