When British poet Amy Key was growing up, she envisioned a life shaped by love--and Joni Mitchell's album Blue was her inspiration. "Blue became part of my language of intimacy," she writes, recalling the dozens of times she played the record as a teen, "an intimacy of disclosure, vulnerability, unadorned feeling that I thought I'd eventually share with a romantic other." As the years ticked by, she held on to this very specific idea of romance like...