Poignant sonics occur whenever these two ambient maestros get together, whether for the classic Cocteau Twins side project The Moon and the Melodies or Guthrie and Budd’s rewarding soundtrack for the film Mysterious Skin. This time around, the spare atmospheres of Harold Budd take precedent, especially on the very understated “How Distant Your Heart” and “Avenue of Shapes.” Guthrie’s ethereal guitar sneaks in here and there on tracks like “She Is My Strength” and bare beats pulse lightly on “Seven Thousand Sunny Years,” but this collaboration still remains their most sedate yet. Use it when you want to chill or space, especially at a glacial pace.