An unlikely pairing of two Washington-bred musicians became a phenomenon in the early 2010s as rapper Macklemore and producer Ryan Lewis conquered the charts with their rousing blend of humorous hip-hop novelties, thoughtful social insight, and motivational anthems that would become staples at arenas, gyms, and dancefloors across the country. The duo scored a handful of chart-toppers in the first half of the decade with multi-platinum singles like "Can't Hold Us," "Same Love," and "Thrift Shop" from their Grammy-winning debut album, The Heist. The follow-up, This Unruly Mess I...