Cardbocchi has vanished. The rest of the choir tries to find him so they can help with whatever he's going through. Tomorrow is the final day of the competition and the choir's last chance to show what they can do. Will they make it there together?
So you should just show your face 
when you sing.
لذا عليكم أن تُظهروا وجوهكم عند الغناء وحسب
Also solltet ihr
mit unverhülltem Gesicht singen!
Por eso, deberían cantar
mostrando la cara.
Por eso, deberíais cantar
mostrando la cara.
Montrez-vous tels que vous êtes.
Per cui dovete solo cantare
come si deve mostrando il vostro volto.
Então cantem de cara lavada!
Петь надо, не скрывая лицо!