This monster hit, created by pop Frankensteins Max Martin and Dr. Luke, has rhythm and melody lines ripped indiscriminately from all their other hits and lyrical inspiration courtesy of a high schooler's Facebook wall. ("I know that I've got issues/ But you're pretty messed up too.") Where a lesser singer might have tried to animate the parts with a vocal lightning storm, Kelly Clarkson sings the words with her signature ease, building to an emotional crescendo that's pointless to resist. Nearly a decade after her journey from waitress to American Idol, Clarkson's lack of pretension remains her greatest asset.