This is the 5129th most frequent Catalan word.
armonico
The Catalan word "armònic" means "harmonic" in English, relating to harmony or pleasing sound.
Here, 'armonico' is used as an adjective to describe the consistent and pleasant quality of the guitar sound.
El so de la guitarra era molt armonico.
The sound of the guitar was very harmonious.
In this context, 'armonico' implies unity and a pleasing combination of voices in the group singing.
Ens agrada cantar en grup perquè el resultat és armonico.
We like singing in groups because the result is harmonious.
'Armonico' here conveys the idea of cooperation and smooth interaction among team members.