Joanne Shaw Taylor is usually pigeonholed as blues-rock, which is accurate in only the most general way. While the 33-year old British singer/guitarist surely operates from a foundation in the electric blues, as she has gone along she's done a good job of expanding her palette. Her latest album, "Reckless Heart," released last week on Sony's Silvertone imprint, is ample proof, as was her Saturday night concert at The Narrows Center for the Arts in Fall River.