Bury My Heart At Wounded Knee by The indigo Girls
Silent Legacy by Melissa Etheridge
Tuesday Morning by Melissa Etheridge
Dear Mr. President by Pink
Me And a Gun by Tori Amos
When I Was a Boy by Dar Williams
Not a Pretty Girl by Ani DiFranco
Hand Song by Nicklecreek
The Prayer by Josh Groan and Charlotte Church
What if God Was One of Us? by Joan Osborn
21 Things I Want in a Lover by Alanis Morrisette
Thank You by Alanis Morissette
Affirmation by Savage Garden
Waiting on the World to Change by John Mayer
We Shall Be Free by Garth Brooks
Can't Hold Us Down by Christina Aguilera
Who's Next? by Tom Lehrer
Forty Hour Workweek by Alabama
Courtesy of the Red, White, and Blue by Toby Keith
A Country Boy Can Survive by Hank Williams
Square Dance and White America from The Eminem Show
Imagine by The Beatles, also covered by A Perfect Circle
I do not agree with every single line of every single song I've listed, but they fit the category.