Yes, I was there, at the beginning of the disco era, when this piece of music made the charts in 1973-74. I always loved it; it's one of the most purely romantic pieces of music I've ever heard (my wife, on the other hand, HATES it). But despite it being in my head for decades, it never clicked as one of the pieces of music that fit a story...
... until Polychrome.
Love's Theme is the piece of music to which I wrote the major section of the battle's aftermath, when the despairing hero discovers that there is joy beyond the loss, the defeated villain finds there may be life and salvation even for such as him, and the freed Heroes of Oz find a greater hope arisen from the destruction that had been wreaked about them. In the end, the Rainbow descends and all of them are Called to the Rainbow Kingdom to witness the proper ending of the Adventure.