Composer Gabriel Kahane blurs the boundaries between popular and classical idioms with “Come On All You Ghosts,” his setting of three poems by San Francisco-based Matthew Zapruder, for voice and string quartet. In each of the songs, Kahane seeks musical equivalents for Zapruder’s exploration of spiritual and philosophical concerns as expressed in the mundanity of contemporary life. The result is a song cycle that is at once adventurous and accessible, with language both naturalistic and absurd, much like life.