The role of a teaching assistant is to maximise learning, create a safe and positive learning environment and to minimise behaviour problems. I would contribute to the lesson by trying to achieve this goal in the following way:
I would ensure all the instruments are ready for the lesson, having checked they are in good repair and unlikely to cause injury.
I would supervise the children using the instruments, i.e. check they hold them correctly, use them appropriately be a good role model demonstrating how instruments should be held and used.
I would support children who are experiencing difficulties
I would monitor children's ability to use instruments, follow instructions, achieve outcome of lesson
Safety would be about the state of the instruments, children's use of them and ensuring mouth pieces are hygienically treated and maintained
Making sure that music sheets are available if needed.
I would also monitor their behaviours by supervising and to try and minimize disruptive behaviour, which will help the children keep interest in the lesson.
I would also ensure that I carry out observations on the children to make sure they have the ability to use the instruments and to achieve the outcome of the lesson.
As a teaching assistant I should also be prepared to offer feedback at the end of the session to either the children or the teacher.