Although the duo LMFAO boasted Euro-pop synths and unmissable riffs well before their hit with David Guetta, "Gettin' Over You," it definitely didn't hurt to be featured on a world-wide smash that spent quality time at number one in France and the U.K. Their second album, Sorry for Party Rocking, arrives at exactly the right time and includes exactly the right mix of energy and humor, plus a surprising amount of sincerity. Before its release, the trailer single, "Party Rock Anthem," had already nested high in the charts of multiple countries, and its presence here confirms that LMFAO are no longer a novelty act