Late night on Friday at the SXSW music festival is usually when the delirium sets in. After three consecutive 16-hour days of live music, even the sharpest brains begin to lose it (so you can imagine what state ours were in). In other words, it was an opportune time to meet up with British songwriter Laura Marling, who owns a voice as clear as the bells at the top of nearby St. David's Episcopal Church. Marling performed an acoustic version of "Walk Alone," a late-night longing for peace of mind from her new album 'Short Movie.'