Nobody was prepared for the success of the Quincy Jones produced extravaganza that is Thriller, since the magnitude of its success was simply unimaginable - an album that sold 40 million copies in its initial chart run, with seven of its nine tracks reaching the US Top Ten. This was a record that had something for everybody, building on the basic blueprint of Off the Wall by adding harder funk, hard rock, softer ballads, and smoother soul - expanding the approach to have something for every audience. This is where a song as gentle and lovely as "Human Nature" coexists comfortably with the tough, scared "Beat It," the sweet schmaltz of the Paul McCartney duet "The Girl Is Mine," and the frizzy funk of "P.Y.T. (Pretty Young Thing)." And, although this is an undeniably fun record, the paranoia is already creeping in, manifesting itself in the record's two best songs: "Billie Jean," where a woman claims Michael is the father of her child, and the delirious "Wanna Be Startin' Somethin'," the freshest funk on the album, but the most claustrophobic, scariest track Jackson ever recorded. These give the record its anchor and are part of the reason why the record is more than just a phenomenon.