Columbia’s Arcade Fire enjoy their best launch ever with “Unconditional l (Lookout Kid),” which takes Most Added honors this week. Other winners include Orchard/Third Man’s Jack White with “What’s the Trick?,” Warner’s RÜFÜS DU SOL with “On My Knees,” Arista’s Bishop Briggs with “High Water” and Virgin/10K Projects’ Surfaces with “I Can’t Help but Feel.”