He finally went there. After 13 episodes doing everything he could to tangentially turn the conversation to prog rock, Dave forced his younger brother to actually listen to some. Rob did not come to the party without preconceptions – namely that 70s prog is the least sexy music in the world, listened to only by celibate Chemistry teachers in Middle England. Did Jethro Tull’s sprawling, tongue-in-cheek single-song opus change his mind? And, most importantly, who the hell is Biggles?