letter of consent for filming

I need to be given permission to film my actors and due to them being children under 18 i will have to seek permission from their parents too.This is format of the letter i will ask them to sign:

I _____________________ give permission  for my child to feature in Anya Gibbins Media studies video that will be used for course work purposes only.

I also need permission to use locations that aren't my own.For example i will be needing to ask the prep school to use their play ground.This is format of the letter i will ask them to sign:

I ___________________ give Anya Gibbins permission to film on my property so it can be featured in her Media studies coursework.

Lastly i have to seek permission from my artist and there label to use their song for my video.

I ___________________ give Anya Gibbins permission to use the song As we are now by Saint Raymond in her media studies coursework but this video won't marketed in any way it is purely featured in coursework only.