Global Discontents is the strongest way into his work in audio. It gathers twelve interviews with David Barsamian, his long-standing interlocutor, on the rise of ISIS, mass surveillance, economic inequality, the Middle East and the question running under all of it: what sort of world is being left to the next generation.
Published within the American Empire Project strand, it is read by Chomsky himself, and the conversational format suits the ear far better than his denser written work. At around seven and a half hours it makes a manageable introduction to a very large body of writing.
Internationalism or Extinction, read by Christopher Ragland, is shorter still at a little over two hours, drawn from talks on nuclear weapons and the climate emergency. Have a look at what is available below and start with the conversations.