Last year’s biggest hits heralded the return of good times unto perpetuity, eternal youth and the enduring pleasure of receiving your first phone call from the set of washboard abs next door. Perhaps taking a cue from Britney Spears’s prescriptive “Till the World Ends,” maybe just drunk on borrowed time, 2013’s biggest singles took the pleasure principle to reckless new, solipsistic heights. It was the sort of year when the real-life counterpart to Mike Seaver could slick his thick hair up and let the devil horns sprout, betting the farm that nothing unlocks a good girl faster than “agreeing” with her with a wink in your eye that lets you both know you’re lying. Still, the year’s best tracks invariably stared down the lies of the moment and opted instead for sincerity and honesty. And the truth often hurts. This embittered sincerity gave listeners a whole new set of hashtags to test out in the hope that, next year, everybody will be dancing and be doin’ it right.