Some Sources of Romanticism: the six A. W. Mellon Lectures (sponsored by the Bollingen Foundation), delivered at the National Gallery of Art, Washington, DC, March–April 1965 (there is a link to a recording of each lecture in the titles below):

1. In Search of a Definition
2. The First Attack on Enlightenment
3. The True Fathers of Romanticism
4. The Restrained Romantics
5. Unbridled Romanticism
6. The Lasting Effects

• Recording dates: 14/3, 21/3, 28/3, 4/4, 11/4, 18/4/65
• First transmission: 7.55 pm 10/8, 8.00 pm 16/8, 7.55 pm 23/8, 7.30 pm 29/8, 7.30 pm 5/9, 7.30 pm 12/9/66 BBC Third Programme
• Durations: 51 minutes 26 seconds, 57 minutes 45 seconds, 53 minutes 20 seconds, 58 minutes 7 seconds, 58 minutes 20 seconds, 69 minutes 32 seconds
• Repeat(s): 5/10, 9/10, 17/10, 24/10, 30/10, 6/11/67 BBC Third Programme (all at 7.30 pm); 1975 in Australia (without IB’s approval); 8.15 pm 6/6, 10.00 pm 12/6/89 etc. BBC Radio 3 in An Evening with Sir Isaiah Berlin
• Producer: Helen Rapp
• Transcript: BBC Written Archives; Berlin Papers
• Recording: BBC Sound Archives T31558–63; BLSA Tapes T132R, T274W, T272W, T10191W, T256W, T275W