As a child, I was quite pop-music oriented and spent many hours listening to the radio with my mom.  Apparently, my very first "favorite" song was "Age of Aquarious", but I have a warm spot in my heart for a lot of early 70s dreck, simply because of the childhood memories that go with them. 
 
So, as a counter-weight to the worst songs thread, I thought people should chime in with their favorite singles, way back when.  Doesn't have to be something that kind of embarrasses you now, just the tunes you really loved when they were "hot". 
 
My top two picks would be 
The Hollies, "Long Cool Woman in a Black Dress" 
Stealers Wheel, "Stuck in the Middle With You" 
 
Love that guitar part in the Hollies tune, and the mysterious lyrics!