It's about when you discover that a major disco hit is in fact written by Chopin by way of Barry Manilow..
Chopin, already behind Gainsbourg's Lemon Incest, is definitely the 1st pop artist.
If you listen to his Prelude in C minor and get the lyrics from Could it be magic?, you can just sing over it - it's impressive.
And that's how you make a hit (and money) without much difficulty: Know your classics! (Also so that it doesn't take you 15 years to make the connections).