(HUDSON, N.Y.) – Perfectly timed to ride the wave of guitar wash currently being propelled by like-minded indie-rock duo Sleigh Bells, the four-piece Baltimore-based band Lower Dens, previews songs off its upcoming, long-awaited second album, Nootropics, at Club Helsinki on Thursday, March 1, 2012, at 8 p.m. Fronted by female singer-songwriter Jana Hunter, whose vocals…