Tift Merritt is on a roll: The sweet-voiced country singer followed her finest album, 2010 heartbreaker See You on the Moon (Fantasy), with Traveling Alone (Yep Roc), a live-in-studio set featuring Calexico’s John Convertino on drums and a centerpiece duet with Andrew Bird (“Drifted Apart”). At Chickie Wah Wah. Sat. Feb. 16