The Cambridge Medieval History, Volume 01, The Christian Roman Empire and the Foundation of the Teutonic Kingdoms: Free Audiobook and Listening Guide
The Cambridge Medieval History, Volume 01, The Christian Roman Empire and the Foundation of the Teutonic Kingdoms by John Bagnell Bury: the LibriVox audiobook summary, 72 original MP3 tracks, 36:11:35 running time and a link to listen.