McFadden & Whitehead. Gene and John. They were Gamble & Huff's secret weapons -- songwriters who penned Back Stabbers and For the Love of Money, songs that defined the O'Jays and filled Philadelphia International's coffers. Then they stepped to the mic themselves and cut Ain't No Stoppin' Us Now. It wasn't just a hit. It was a declaration. The Phillies adopted it. The civil rights movement adopted it. Every person who ever got knocked down and stood back up adopted it.