The songs are big and heartfelt on Guesthouse, the fifth album by Boston duo David Wax Museum. It’s rootsy Americana influenced by Son music from Mexico, and largely played with Mexican instruments (including a donkey jawbone). It’s not perfect; the cutesy title track is oddly reminiscent of Paul Simon’s “You Can Call Me Al.” Otherwise, though, their shtick is pretty appealing, largely due to the unexpected flourishes. “Dark Night of the Heart” features over-the-top echo effects and a bloopy finale, while ukulele-based singalong “Young Man” throws a curveball horn section in partway through. Rochester duo Auld Lang Syne open.