This is the 935th most frequent Spanish word.
comenzaron
"Comenzaron" means "they began" or "they started."
Here, 'comenzaron' is used as the past simple tense of 'comenzar' to denote the action of starting studying in the past, involving multiple people.
Comenzaron a estudiar para el examen final.
They began studying for the final exam.
In this case, 'comenzaron' describes the start of the festivities in a formal context, focusing on the event as the subject.
Comenzaron las festividades con un discurso del alcalde.
The festivities began with a speech from the mayor.
'Comenzaron' indicates the initiation of the birds' singing activity in the past, conveying a narrative tone.