In 1974 the British progressive rock group Genesis released their double concept album The Lamb Lies Down on Broadway, now widely regarded as a classic album of 1970s progressive rock. This album has inspired nearly fanatical devotion among progressive rock fans, some of whom have constructed elaborate web sites purporting to ’explain’ The Lamb. The album is a surreal allegory drawing its material from religious, literary and psychological themes. More than thirty years after its release, The Lamb Lies Down on Broadway still enthralls listeners, earning the distinction of being Genesis’s most consistently selling back-catalogue release.