Ali Tamposi cemented her status as a songwriting force by penning Kelly Clarkson's 2011 self-reliance anthem "Stronger". Her study of pop's many styles—sumptuous R&B on Ciara's "Overdose", delicate acousti-pop on her X Factor protégés Alex & Sierra's "Little Do You Know", soul-tinged EDM on DJ Snake's Justin Bieber showcase "Let Me Love You"—has made her a go-to songwriter in the '10s.