And to get this back on Folk Music, I want to note that the tune for Gilligan's Isle appears to be a direct rip-off of The DAYS OF FORTY NINE.
Back in my youth, I was sitting around trying to learn The Days of '49 in DADGAD and someone said to me, "Oh, you know the tune to Gilligan's Isle!" I am happy to say that I was confused by his statement because, at that time, I had never heard the tune because I had never watched the TV show.
Made me feel real superior and arrogant. Still does!
Roger in Baltimore