In jazz parlance, “playing changes” refers to an improviser’s resourceful path through a chord progression. In this definitive guide to the jazz of our time, leading critic Nate Chinen boldly expands on that idea, taking us through the key changes, concepts, events, and people that have shaped jazz since the turn of the century—from Wayne Shorter and Henry Threadgill to Kamasi Washington and Esperanza Spalding; from the phrase “America’s classical music” to an explosion of new ideas and approaches; from claims of jazz’s demise to the living, breathing scene that exerts influence on mass culture, hip-hop, and R&B. Grounded in authority and brimming with style, packed with essential album lists and listening recommendations, takes the measure of this exhilarating moment—and the shimmering possibilities to come.