Psychedelic Philly duo Bridge Underwater are bringing their hooky garage rock to Northern Liberties tonight for a free show for the over-21 at Gunners Run. The guys take the stage at 9, and the back-catalogue of music at their disposal is somewhat extensive. Their most recent single, “So What,” is a rocker, but if you’re not familiar with the band, get to know them with their compilation of early recordings called Trying Your Best: An Introduction. You can listen to it below, or grab yourself a name-your-own-price download.