“As the opening title track to Rachel Zeffira's debut album, "The Deserters" offers, by way of introduction, a farewell: "One day, we'll meet again/ One day, we'll speak like we did back then," she sings to a soon-to-be-ex or frenemy, though those forlorn words are delivered in a calm voice that suggests a certain contentment with letting fate take its course. It's a philosophy that could easily be”