While mainstream artists like Ke$ha and P!nk have recruited fun. frontman Nate Ruess to lend some whimsical songwriting to their pop projects, Sara Bareilles has opted to bring in his bandmate, guitarist Jack Antonoff, to co-write her latest declaration of independence. Despite naming her breakout album "Little Voice,"Bareilles has always been an extroverted vocalist on adult contemporary radio, unafraid of aiming high during crescendos or shouting a line like "I want to see you be brave!" as if the Rapture was afoot.

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