The British producer Jamie Smith, a.k.a. Jamie xx, doesn't sing. Instead, his haunted aesthetic marks some of the best electronic records of recent years—including those from his group, The xx, and his 2015 solo debut, In Colour—and it encompasses both forlorn house music and melancholy indie rock. Given his penchant for smart restraint, the title “All Under One Roof Raving” seems like an understatement.