4. Macklemore and Ryan Lewis - 'Same Love'
Why we like it: It is the first pop hit to support gay marriage in a way that left no room for doubt between Macklemore’s heartfelt rap and Mary Lambert’s beautiful chorus.
Burn out factor: Medium: The message never gets old, but with a lack of a catchy hook, the song doesn’t wear particularly well
Will we remember it 10 years from now? Yes, for its social significance.