Something snapped inside River's mind. Nothing bad, but something....different. With his arms lost to the music, they went to the bow which met the fiddle. Out of the meeting of the entities the sound echoed and whistled through the range with an Irish bar tune. Lightning sparked around his feet as he jumped around. His moves were hypnotic with the mix and every now and then sound would whip about. He didn't know what came over him, but he was joyous.