Community service:

Katy Perry, “Firework,” pop, 2010,

http://www.youtube.com/watch?v=QGJuMBdaqIw

John Mayer, “Waiting on the World to Change,” pop, 2006,

http://www.youtube.com/watch?v=oBIxScJ5rlY

John Mayer, “Daughters,” pop, 2003,

http://www.youtube.com/watch?v=rZLbUIa7exE

John Lennon, “Happy Xmas (War Is Over),” pop, 1972,

http://www.youtube.com/watch?v=s8jw-ifqwkM

Micahel Jackson, “Black or White,” pop, 1991,

http://www.youtube.com/watch?v=F2AitTPI5U0