Since their beginnings, indie folk duo the Milk Carton Kids have been associated with a hushed, melancholy brand of song as well as with effortless guitar technique, with both Kenneth Pattengale and rhythm guitarist Joey Ryan playing vintage 1950s-model Martin and Gibson guitars, respectively. With their fourth studio album, All the Things That I Did and All the Things That I Didn’t Do (2017), they recorded with a backing band for the first time, before returning to the duo model. Since then, however, they’ve toyed with instrumentation, and their seventh LP, Lost Cause Lover Fool, finds them incorporating banjo, mandolin, bass, and/or percussion on some tracks for subtle texture shifts on an album guided by the theme of transformation. At the same time,…