My friend Marc Weingarten co-edited a book with Tyson Cornell called Yes Is The Answer (and Other Prog Rock Tales). I haven't read it yet but it sounds excellent:
Progressive rock is maligned and misunderstood. Critics hate it, hipsters scoff at it. Yes Is The Answer is a pointed rebuke to the prog-haters, the first literary anthology devoted to the sub genre. Featuring acclaimed novelists, Rick Moody, Wesley Stace, Seth Greenland, Charles Bock, and Joe Meno, as well as musicians Nathan Larson, and Peter Case, Yes Is The Answer is the first book that dares to thoughtfully reclaim prog-rock as a subject worthy of serious consideration.