What are some good songs to put with my powerpoint/video presentation?

I am doing something kind of like a PSA, but for a class. What are some songs that give hope and encouragement to never give up? Also with that being said, what are some songs that are about children getting bullied for being different? The PSA thing that I am doing is about how autistic children are treated in schools, and what we as society can do to change people’s perspective of austic children and help end the bullying.