Many, possibly every episode of Rainbow Quest - Lost treasure now found, like a coprolite at the back of a stenchy old cave. Rainbow Quest was a late sixties folk music program, mostly unrehearsed, on which host Pete Seeger brought just about every great folk act and sang every great folk song you can think of. I can't think of any.

If you are a folkie you will lose a day or two on this. Some demented old loon has posted just about every minute of it to YouTube. The quality is baaaaaaaaad - sometimes it's just a camera photographing an antediluvian TV, but it's classic material that will hopefully one day decay and collapse into the remnants of a doomed star, for which day I long and pray. But, enjoy. Summary of each episode.