Copyright free music for my teaser trailer

As I am aware, I am not allowed to use any copyright material within my coursework, therefore I have come up with two possible ways of getting copy right music for my teaser trailer.

Firstly, I contacted my friend who is currently a university student studying music asking him if it would be possible for him to compose a short piece of music for my teaser trailer.

Secondly, I have researched for copyright free sound effects and music online.