I found this song on YouTube over a month ago, but neglected to share it here. The song is "I Am Humanity", and is by Bob Rafkin. I found it when I search on YouTube for the phrase "I am humanity".
Sample Lyrics, first versus and chorus:
I can't say I am free of guilt --
I bear responsibility.
For everything there is outside,
I also have inside of me.
The beauty and the joy,
I know I'm quick to claim --
But I must also recognize
That I'm the hand that brings the pain.
I'm part of all eternity,
The center of the wheel
The one who lives an honest life,
and the one who lives to steal
I witness every age,
I'm the foolish, I'm the sage --
I am everyone oppressed and free,
I am Humanity.