Matthew Houck released his album Muchacho through his band Phosphorescent in 2013 to strong praise. And to close out the year, he decided to celebrate with four shows in his borough. All four, one solo and three with a full-band, at the Music Hall of Williamsburg had sold out one after another. Julianna Barwick was recruited later on to be the opener. Poised behind her keyboards on the darkened stage, Barwick’s ethereal soundscapes enveloped people as they entered. Then after a stage change in which multitudes of flowers, electric tealights and incense sticks garnished the stage, Phosphorescent was ready to perform.