Copyright

I've been look at on many sites but there's not much suitable and copyright free music to use, I won't be able to use it if it's copyrighted so I have to prevent to buy The music that I am going to use is free and I find it in iMovie default musics so I don't think there's a copyright issues as long as it's not use in commercial products. And I won't use any secondary sources like video clips, news headlines in my film.