One of my all-time favourite songs and one that guides me in all things, not least my professional work on behalf of all my clients:

Optimistic by Sounds of Blackness

"When in the midst of sorrow
You can't see up when looking down
A brighter day tomorrow will bring

You hear the voice of reason
Telling you this can't never be done
No matter how hard reality seems
Just hold on to your dreams

Don't give up and don't give in
Although it seems you never win
You will always pass the test
As long as you keep your head to the sky
You can win as long as you keep your head to the sky
You can win as long as you keep your head to the sky
Be optimistic

 If things around you crumble
No, you don't have to stumble and fall
Keep pushing on and don't you look back
I know of storms and strive
I been around them all of life
Just think ahead and you'll be inspired
To reach higher and higher.
You'll always do your best
If you learn to never say never
You maybe down, but you're not out.
Don't give up and don't give in
Although it seems you never win
You will always pass the test
As long as you keep your head to the sky
You can win as long as you keep your head to the sky (you can win child!)
You can win as long as you keep your head to the sky
Be optimistic

Don't you let nobody stop you
Be optimistic
You can win, yes
Never say die."

Source: LyricFind
Songwriters: Gary Dennis Hines / James Samuel Harris / Terry Steven