Scott Walker's solo career dramatized a constant clash between commercial success and artistic endeavor. As the leader of pop trio the Walker Brothers, he spent the mid-'60s enjoying chart success, his gliding baritone voice at the center of several notable hits for the group. After striking out solo in 1967 with a string of adventurous but still pop-leaning albums, Walker's solo work took a sharp turn toward experimentalism in the '80s. Infrequent releases throughout the '90s, 2000s, and 2010s were unrecognizable from the melancholic Baroque pop of Walker's earliest days, but...