Neil Young has locked his gaze on the rearview mirror, most notably with a memoir, “Waging Heavy Peace” published last month. Before that he reunited with Crazy Horse, the hellacious band he has collaborated on and off with for more than four decades. Over the summer they put out “Americana,” a ragtag reimagining of folk standards. Now comes “Psychedelic Pill,” which drudges up Young’s past to see how it informs his present.
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