"Instant Karma!" (John Lennon)

When I first heard John Lennon's 1970 single "Instant Karma!" as a little kid, I had no clue what karma was.  (I'd venture that was true of most listeners.)  But, my God, the sound of this song.  It was my first introduction to producer Phil Spector's "Wall of Sound" and unlike anything I'd ever heard.  There was so much reverb and yet so much punch—particularly Alan White's drums.  (His drum fills alone make the song a classic.)  
But you also can't ignore that vital piano line and ardent chorus of singers backing Lennon's throat-ripping vocal: Well we all shine on / Like the moon and the stars and the sun.  There's a galaxy of beauty in that sentiment.  
It's impossible not to feel fantastic after hearing this rallying cry for humanity to get its act together.