Many years ago I caught a little bit of an excellent Edward Woodward programme on TV and I've been searching for it ever since. I only remembered that he was playing an upright piano and singing the song "Kalamazoo" in a hauntingly sad way. I couldn't get it out of my mind. Woodward tended to play sad and introspective roles. A shady government agent with no friends, carrying a pistol. Callan. But this was much sadder than that.
Now after 30 years I've found it! "When Day is Done", an episode of Thames Television's Armchair Theatre from 1975.