Songs That Are Inspirational and Hopeful?

For my school's fall show this year, my director has picked the theme of inspiration and hope. I'm having trouble finding appropriate songs. I was thinking something along the lines of a love song. Any help would be very much appreciated.

Thank you for your time,
Kate

Suggestion:

Let the River Run – Carly Simon
Keep Holding On – Avril Lavigne
Here Comes the Sun – The Beatles
and if you want to remind everyone of Glee: Don't Stop Believin' – Journey