If there's a single record that might be said to occupy the heart of prog rock, there's a good case to be made for Genesis's 1972 "Foxtrot," a record that begins with the cinematic, Mellotron-drenched "Watcher of the Skies," comments on rapacious landlords in a mixture of Dickens and dystopian sci-fi with "Get 'Em Out by Friday" and then winds up with "Supper's Ready," clocking in at almost 24 minutes, a journey through mystery, mythology, identity crisis, and the Book of Revelation that will have you humming along in 9/8. This week, Charlie, Henry, and Bill face down the task of explaining just why this thickly-packed, tuneful and ambitious record winds up an all-thriller, no-filler example of prog rock's pleasures.

On Youtube:

"Supper's Ready" live in concert (with costume changes!)

"Foxtrot" full album