This is the 111th most frequent Hebrew word.
כולם
"Everyone" or "all of them."
Here, 'כולם' refers to 'everyone,' signifying all people in the context of those invited or expected at the party.
כולם באו למסיבה.
Everyone came to the party.
In this context, 'כולם' is used to address a group, indicating that each individual in the group ('children') is included in the directive.
ילדים, כולם צריכים לסיים את המשימות שלהם.
Children, everyone needs to finish their tasks.
Here, 'כולם' refers to 'all of them,' relating specifically to the songs mentioned earlier in the sentence.