The 11 numbers on Regina Spektor’s new album, “What We Saw From the Cheap Seats” are as disparate sounding as any in her decade-long career, ranging from the not-quite-straight power ballad “How,” to the gentle singer-songwriter musing “Small Town Moon,” to the grotesque Broadway-style melodrama “Open.” Some numbers go so far into the whimsical or theatrical, it’s no wonder that Entertainment Weekly music critic Melissa Maerz calls Spektor “the Queen of Quirk.” She comes to the Orpheum Theatre on Thursday.