I, too, was not sure what you wanted.
Quotations of 5 - 7 words are hard to come up with. A few ("let them eat cake") are too short, most are too long. I did think of these:
Shakespeare:
Romeo, Romeo, wherefore art thou Romeo?
Neither a borrower nor a lender be.
Beware the ides of March.
Sir Winston Churchill:
The price of greatness is responsibility.
Charles de Gaulle:
The graveyards are full of indispensable men.
Julius Caesar:
I came. I saw. I conquered.
As for sayings, we have:
To err is human, to forgive divine.
Two wrongs don't make a right.
Every cloud has a silver lining.
Out of sight, out of mind.
Blood is thicker than water.
A penny saved is a penny earned.
Others will have to help with the songs. I don't listen to the radio much, and even if I did, I have no idea what is popular in the UK.
Hope this helped,
- Vicki
