Who are they?
They are CHILDREN.
What is this?
It is a TROMBONE.
What is this?
It is a TRUMPET.
Who are they?
They are PUPILS
Where are these pupils?
They are in a MUSIC CLASSROOM at school.
What are these called?
They are INSTRUMENTS
What are these pupils / children wearing?
A UNIFORM
What is this?
It is a TUBA.