Isobel Isogloss eh?
You really took that idea to heart :-) - but hang on didn't Donovan write a song about you? - Oh no er, Jennifer, Juniper ...
"We Work The Black Seam" - Sting - on Album "The Dream of the Blue Turtles" -1985. I suspect that will be not at all like our 80 voice arrangement, but the lyrics are freely available on the web.
When I've time I'll think further.
and I should say, there's a nice poster - original artwork by David Williams of Silsden Singers, and graphic design by Tiny Taylor of The Demon Barbers....