This is a treasure. I too recorded the music from the TV to cassette in 1973 when it aired, and still sing the Rummy song. I also searched for a copy in vain for several years. I recently saw it again at my girl friend's house. Her grandfather was one of the old captains interviewed and she had a copy. The credits went by too fast for me to catch the name of the composer.

However, I just found this online: http://www.worldcat.org/title/gloucestermen/oclc/5553264

This show really should be cleaned up and put on DVD. One of the old timers interviewed on that 1973 show was 105. Others weren't much younger.