2013 release from the Alt-Rock/Avant-Garde instrumental band. Listeners have come to expect a lot from Secret Chiefs 3. for Book of Souls, second in the band's mega-trilogy (first being Book of Horizons, 2004), they demand nothing less than a vertigo-inducing follow-up. True to expectation, Book of Souls: Folio a is a full-length album densely packed with musical skyscrapers. Over a decade in the making, it's Secret Chiefs 3's most elaborate work yet.