London-based soul duo Mrcy’s debut on Dead Oceans, the eight-track Volume 1, is full of enjoyable updates on retro sounds. Made up of producer Barney Lister and vocalist Kojo Degraft-Johnson, Mrcy (pronounced Mercy) combines a full spectrum of atmospheric samples with tight grooves and Degraft-Johnson’s mighty, world-class vocals. Volume 1‘s lead single, “Lorelei,” is a prime example of the duo’s …