Born this Way - Lady Gaga (pro-diversity, acceptance)
Just a Girl - No Doubt (anti-sexism; female empowerment)
Where Is The Love - The Black Eyed Peas (empathy and radial harmony)
Long Way To Go - Gwen Stefani (anti-racism, particularly in respect of inter-racial relationships)
99 Red Balloons - Nena (anti-war)
Beautiful - Christina Aguilera (self-acceptance and anti-bullying)
What It Feels Like For A Girl - Madonna (female empowerment)
1-800-273-8255 - Logic ft. Alessia Cara and Khalid (mental health awareness; the song title is a suicide prevention hotline in the US)
Earth - Lil Dicky (environmental awareness; features ~30 other artists)
Rich, White, Straight Men - Kesha (pro-equality; anti-racist, anti-sexist)
Land of the Free - The Killers (pro gun control)