Hey, That's No Way To Say Goodbye / The Stranger Song / Suzanne
Leonard Cohen and Judy Collins performing 2 songs together plus one solo performance by Leonard, recorded for a TV special broadcast in 1976.
(Probably their only duo performance that was ever captured on film. )
[Technical note:
The picture quality of the source material is not great and it has a non-standard screen size - that's why it wasn't enlarged further for this video and it has been put in a frame in order to achieve a suitable result for modern screen sizes.]