Erin Keane's The Gravity Soundtrack is, paradoxically, the most irreverent of the books considered here, as well as the most concerned with spirituality. Simultaneously playful and careful, her poems move, like Mueller's and Leo's, among free verse, form, and the appearance of form, with stanzas of the same number of lines, occasional syllabics ("Where the Wild Things Are"), numerous unrhymed sonnets, and a terrific, barely recognizable villanelle, "Science Fiction." As with the other authors, there's cross-pollination among Keane's poetry and other genres, most notably science fiction, children's lit, and popular music. The dominant mode of the collection, however, is the persona poem. The Gravity Soundtrack is peopled by Johnny Cash, Orpheus, Aphrodite, Aunt Molly, and a legion of characters from children's books.