“Here we walk in the verdant groves…” — all afternoon I’d been humming a Shaker song, attributed to the Shaker community in Enfield, New Hampshire; I couldn’t get the tune out of my head. Suddenly I realized why the tune seemed so familiar: the first phrase was exactly the same as the first phrase of the theme song to the old television show “Gilligan’s Island”: “Sit right back and you’ll hear a tale…” Even though the Shakers sang it first, that spoiled the song and made me want to stop singing it. But I couldn’t, and now hours later the tune is still running round and round in my head — “Sit right back and you’ll hear a tale…, Here we walk in the verdant groves…” — and I just can’t get rid of it. Maybe if I write about it, I can get it out of my head and make you start humming it instead.