Helen and Gavin chat about the Second Doctor Who Special, EXmas, and Dream Scenario, and it's Week 100 from the list of Rolling Stone's 500 Greatest Songs Ever, numbers 5 to 1; Smells Like Teen Spirit by Nirvana, Like a Rolling Stone by Bob Dylan, A Change is Gonna Come by Sam Cooke, Fight the Power by Public Enemy, and Respect by Aretha Franklin.